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OTHER COMPREHENSIVE INCOME - Changes in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 7,507.9 $ 6,952.2 $ 6,567.7
Other comprehensive income (loss) before reclassifications 9.7 4.2 (6.5)
Amounts reclassified from AOCI 6.7 6.7 4.5
Other comprehensive income (loss) 16.4 10.9 (2.0)
Ending balance 8,142.5 7,507.9 6,952.2
Accumulated Other Comprehensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (143.8) (154.7) (152.7)
Other comprehensive income (loss) 16.4 10.9 (2.0)
Ending balance (127.4) (143.8) (154.7)
Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (19.4) (21.0) (22.5)
Other comprehensive income (loss) before reclassifications 0.0 0.0 0.0
Amounts reclassified from AOCI 1.7 1.6 1.5
Other comprehensive income (loss) 1.7 1.6 1.5
Ending balance (17.7) (19.4) (21.0)
Pension and Postretirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (124.4) (133.7) (130.2)
Other comprehensive income (loss) before reclassifications 9.7 4.2 (6.5)
Amounts reclassified from AOCI 5.0 5.1 3.0
Other comprehensive income (loss) 14.7 9.3 (3.5)
Ending balance $ (109.7) $ (124.4) $ (133.7)