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LEASES - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
LEASES.    
Operating lease right of use assets $ 122.5 $ 110.1
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent  
Accrued liabilities $ 16.9 15.6
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts Payable and Accrued Liabilities, Current  
Non-current operating lease liabilities $ 141.3 129.2
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current operating lease liabilities  
Total lease liabilities $ 158.2 $ 144.8