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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period $ 2,400.7 $ 2,296.9
Other adjustments (0.8) 1.4
Balance at the end of the period 2,373.8 2,270.3
Pensions    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (20.3) (25.8)
Amortization of net gain (loss) 0.1 0.3
Balance at the end of the period (20.2) (25.5)
Post Retirement    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period 11.0 18.7
Amortization of prior service cost (0.7) (0.7)
Amortization of net gain (loss) (0.2) (0.4)
Balance at the end of the period 10.1 17.6
Non-Qualified Plans    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (0.2) 0.1
Balance at the end of the period (0.2) 0.1
Other    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period 1.3 0.1
Foreign currency exchange (0.9) (0.3)
Other adjustments 0.1 1.7
Balance at the end of the period 0.5 1.5
Accumulated Other Comprehensive Income (Loss)    
Changes in accumulated other comprehensive income (loss) by component, net of taxes    
Balance at the beginning of the period (8.2) (6.9)
Amortization of prior service cost (0.7) (0.7)
Amortization of net gain (loss) (0.1) (0.1)
Foreign currency exchange (0.9) (0.3)
Other adjustments 0.1 1.7
Balance at the end of the period $ (9.8) $ (6.3)