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LEASES - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
LEASES.    
Operating lease right of use assets $ 110.1 $ 111.0
Current operating leased liabilities $ 15.6 $ 12.5
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 $ 129.2 $ 132.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current operating lease liabilities Non-current operating lease liabilities
Total lease liabilities $ 144.8 $ 144.6