Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Fair Value of Pension Assets) (Details)

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BENEFIT PLANS (Fair Value of Pension Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Hedge funds, minimum number of days notice prior to redemption 30 days    
Hedge funds, maximum number of days notice prior to redemption 90 days    
Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets $ 515.3 $ 518.9 $ 570.1
Large-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 128.1    
Small- and Mid-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 31.4    
International Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1],[2] 80.8    
Fixed Income | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [2] 174.2    
Private Equity      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Commitments related to investments 12.3    
Private Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [3] 33.5    
Hedge Funds | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [4] 33.7    
Real Assets      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Commitments related to investments 0.5    
Real Assets | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [5] 19.3    
Cash | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 14.3    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets 189.4    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Large-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 128.1    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Small- and Mid-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 31.4    
Quoted Prices in Active Markets for Identical Assets (Level 1) | International Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1],[2] 15.6    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [2] 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [3] 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge Funds | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [4] 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Assets | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [5] 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 14.3    
Significant Other Observable Inputs (Level 2) | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets 239.4    
Significant Other Observable Inputs (Level 2) | Large-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 0.0    
Significant Other Observable Inputs (Level 2) | Small- and Mid-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 0.0    
Significant Other Observable Inputs (Level 2) | International Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1],[2] 65.2    
Significant Other Observable Inputs (Level 2) | Fixed Income | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [2] 174.2    
Significant Other Observable Inputs (Level 2) | Private Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [3] 0.0    
Significant Other Observable Inputs (Level 2) | Hedge Funds | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [4] 0.0    
Significant Other Observable Inputs (Level 2) | Real Assets | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [5] 0.0    
Significant Other Observable Inputs (Level 2) | Cash | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 0.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets 86.5    
Significant Unobservable Inputs (Level 3) | Large-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 0.0    
Significant Unobservable Inputs (Level 3) | Small- and Mid-Cap Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] 0.0    
Significant Unobservable Inputs (Level 3) | International Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1],[2] 0.0    
Significant Unobservable Inputs (Level 3) | Fixed Income | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [2] 0.0    
Significant Unobservable Inputs (Level 3) | Private Equity | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [3] 33.5    
Significant Unobservable Inputs (Level 3) | Hedge Funds | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [4] 33.7    
Significant Unobservable Inputs (Level 3) | Real Assets | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [5] 19.3    
Significant Unobservable Inputs (Level 3) | Cash | Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Fair value of plan assets [1] $ 0.0    
[1] Fair value is based on observable market prices for the assets.
[2] For the portion of this asset class categorized as Level 2, fair value is determined using dealer and broker quotations, certain pricing models, bid prices, quoted prices for similar assets and liabilities in active markets, or other inputs that are observable or can be corroborated by observable market data.
[3] Private equity investments are initially valued at cost. Fund managers periodically review the valuations utilizing subsequent company-specific transactions or deterioration in the company’s financial performance to determine if fair value adjustments are necessary. Private equity investments are typically viewed as long term, less liquid investments with return of capital coming via cash distributions from the sale of underlying fund assets. The Plan intends to hold these investments through each fund’s normal life cycle and wind down period. As of December 31, 2016, we had $12.3 million of remaining commitments related to these private equity investments.
[4] Fair value is reported by the fund manager based on observable market prices for actively traded assets within the funds, as well as financial models, comparable financial transactions or other factors relevant to the specific asset for assets with no observable market. These investments are redeemable quarterly with a range of 30 – 90 days notice.
[5] The fair value of Real Assets are reported by the fund manager based on a combination of the following valuation approaches: current replacement cost less deterioration and obsolescence, a discounted cash flow model of income streams, and comparable market sales. As of December 31, 2016, we had $0.5 million of remaining commitments related to the real asset investments.