Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Reconciliation of Beginning and Ending Balances for Plan Assets Valued using Significant Unobservable Inputs (Details)

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BENEFIT PLANS - Reconciliation of Beginning and Ending Balances for Plan Assets Valued using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Private Equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance $ 18.6 $ 24.1
Return on plan assets:    
Unrealized 0.0 1.3
Realized (2.0) 1.7
Purchases 0.5 1.1
Sales (4.2) (9.6)
Ending balance 12.9 18.6
Hedge Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 34.3 35.0
Return on plan assets:    
Unrealized 2.3 (0.6)
Realized (0.3) 0.0
Purchases 0.0 0.0
Sales 0.0 (0.1)
Ending balance 36.3 34.3
Real Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 19.9 18.7
Return on plan assets:    
Unrealized 0.7 1.6
Realized (0.6) 0.0
Purchases 0.1 0.3
Sales (1.2) (0.7)
Ending balance $ 18.9 $ 19.9