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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]      
Income tax expense $ (144.9) $ (120.3) $ (75.9)
Net income 414.4 326.7 $ 294.9
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]      
Other income (expense), net (1.5) (1.5)  
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]      
Other income (expense), net 5.4 4.4  
Reclassification out of Accumulated Other Comprehensive Income | Pension and Post Retirement Benefit Plans      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]      
Other income (expense), net 3.9 2.9  
Income tax expense (1.0) (0.8)  
Net income $ 2.9 $ 2.1