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FINANCING ARRANGEMENTS - Components of Long-Term Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Principal Amount $ 2,107.8 $ 2,110.5
Unamortized discount and debt issuance cost 28.8 30.5
Net Debt 2,079.0 2,080.0
Less short-term and current portion of long-term debt, principal amount 9.6 9.5
Less short-term and current portion of long-term debt, Unamortized discount and debt issuance cost 0.0 0.0
Less short-term and current portion of long-term debt, Net Debt 9.6 9.5
Total long-term debt, net of current portion, principal amount 2,098.2 2,101.0
Debt excluding current, unamortized discount and debt issuance costs 28.8 30.5
Total long-term debt, net of current portion 2,069.4 2,070.5
Senior secured revolving credit facility due 2026 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Principal Amount 0.0 0.0
Unamortized discount and debt issuance cost 0.0 0.0
Net Debt $ 0.0 $ 0.0
Weighted average interest rate 0.00% 0.00%
Senior secured term loan due 2029 | Secured Debt    
Debt Instrument [Line Items]    
Principal Amount $ 726.1 $ 727.9
Unamortized discount and debt issuance cost 18.0 18.9
Net Debt $ 708.1 $ 709.0
Weighted average interest rate 7.86% 7.88%
5.75% senior notes due 2025 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate, stated percentage 5.75% 5.75%
Principal Amount $ 650.0 $ 650.0
Unamortized discount and debt issuance cost 2.3 2.8
Net Debt $ 647.7 $ 647.2
Weighted average interest rate 5.75% 5.75%
7.125% senior notes due 2030 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate, stated percentage 7.125% 7.125%
Principal Amount $ 725.0 $ 725.0
Unamortized discount and debt issuance cost 8.5 8.8
Net Debt $ 716.5 $ 716.2
Weighted average interest rate 7.125% 7.125%
Other Debt    
Debt Instrument [Line Items]    
Principal Amount $ 6.7 $ 7.6
Unamortized discount and debt issuance cost 0.0 0.0
Net Debt $ 6.7 $ 7.6