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FAIR VALUE MEASUREMENT - Derivative contracts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments    
Unrealized fair value of derivative assets, current $ 7.2 $ 3.8
Unrealized fair value of derivative assets, non-current 4.5 0.8
Unrealized fair value of derivative assets 11.7 4.6
Unrealized fair value of derivative liabilities, current (4.3) (22.2)
Unrealized fair value of derivative liabilities, non-current (0.8) (9.6)
Unrealized fair value of derivative liabilities (5.1) (31.8)
Net asset (liability) 6.6 (27.2)
Total return swap contract    
Financial Instruments    
Net asset (liability) (1.3) 3.2
Unrealized gain (loss) recorded in AOCI 0.0 0.0
Derivative Contracts    
Financial Instruments    
Net asset (liability) 6.6 (27.2)
Unrealized gain (loss) recorded in AOCI 5.8 (23.3)
Foreign currency forward and collar contracts    
Financial Instruments    
Net asset (liability) 3.9 (21.8)
Unrealized gain (loss) recorded in AOCI 2.6 (15.8)
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts 0.7  
Energy Swap    
Financial Instruments    
Net asset (liability) 4.0 (8.6)
Unrealized gain (loss) recorded in AOCI 3.2 $ (7.5)
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts $ 2.5