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STOCKHOLDERS' EQUITY - Schedule of Changes in Accumulated Other Comprehensive (Loss) Income by Component (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 3,444.2 $ 2.7
OCI before reclassifications 3.0 (3.4)
Amounts reclassified from AOCI 1.5 (0.2)
Other comprehensive income (loss) 4.5 (3.6)
Ending balance 3,333.1 (349.8)
Total AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (17.2) (7.5)
Other comprehensive income (loss) 4.5 (3.6)
Ending balance (12.7) (11.1)
Gain (Loss) On Derivative Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0.3 0.0
OCI before reclassifications 0.3 0.0
Amounts reclassified from AOCI 1.7 0.0
Other comprehensive income (loss) 2.0 0.0
Ending balance 2.3 0.0
Amounts reclassified from AOCI, before tax 2.3  
Amounts reclassified from AOCI, tax (benefit) (0.6)  
Cumulative Translation Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (19.6) (9.9)
OCI before reclassifications 2.7 (3.4)
Amounts reclassified from AOCI 0.0 0.0
Other comprehensive income (loss) 2.7 (3.4)
Ending balance (16.9) (13.3)
Net Unrealized Actuarial Gain (Loss) in Postretirement Benefit Plan    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 2.1 2.4
OCI before reclassifications 0.0 0.0
Amounts reclassified from AOCI (0.2) (0.2)
Other comprehensive income (loss) (0.2) (0.2)
Ending balance 1.9 2.2
Amounts reclassified from AOCI, before tax $ 0.2 $ 0.2