Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
BENEFIT PLANS (Fair Value of Pension Assets) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Hedge funds, minimum number of days notice prior to redemption 30 days    
Hedge funds, maximum number of days notice prior to redemption 90 days    
Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Commitments related to investments $ 12.8    
Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Commitments related to investments 2.5    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 518.9 $ 570.1 $ 568.1
Pension Benefits | Large-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 123.0    
Pension Benefits | Small- and Mid-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 28.8    
Pension Benefits | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 79.1    
Pension Benefits | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 163.0    
Pension Benefits | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 41.9    
Pension Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 54.0    
Pension Benefits | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.4    
Pension Benefits | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11.7    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 179.5    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Large-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 123.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Small- and Mid-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 28.8    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11.7    
Significant Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 226.1    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Large-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Small- and Mid-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Pension Benefits | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63.1    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 163.0    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Pension Benefits | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 113.3    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Large-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Small- and Mid-Cap Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 41.9    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 54.0    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.4    
Significant Unobservable Inputs (Level 3) | Pension Benefits | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0