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LEASES - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
LEASES.    
Operating lease right of use assets $ 130.6 $ 136.6
Current operating lease liabilities $ 21.0 $ 20.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current
Non-current operating lease liabilities $ 144.3 $ 150.8
Total leased liabilities $ 165.3 $ 171.6