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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period $ 1,667.4 $ 961.2
Amortization of prior service cost (0.9) (1.1)
Amortization of net loss 0.8 1.2
Other adjustments 0.3 (0.2)
Balance at the end of the period 1,910.7 1,028.9
Pensions    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (39.1) (61.7)
Amortization of prior service cost (0.2) (0.4)
Amortization of net loss 0.6 0.9
Balance at the end of the period (38.7) (61.2)
Post Retirement    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period 10.1 12.2
Amortization of prior service cost (0.7) (0.7)
Amortization of net loss 0.2 0.2
Balance at the end of the period 9.6 11.7
Non-Qualified Plans    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (0.7) (0.6)
Amortization of net loss   0.1
Balance at the end of the period (0.7) (0.5)
Other    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (1.2) (0.7)
Foreign currency exchange 0.3 (0.2)
Balance at the end of the period (0.9) (0.9)
Accumulated Other Comprehensive Income (Loss)    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (30.9) (50.8)
Amortization of prior service cost (0.9) (1.1)
Amortization of net loss 0.8 1.2
Foreign currency exchange 0.3 (0.2)
Balance at the end of the period $ (30.7) $ (50.9)