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LEASES - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
LEASES.    
Operating lease right of use assets $ 114.1 $ 111.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent  
Current operating leased liabilities $ 15.2 12.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts Payable and Accrued Liabilities, Current  
Non-current operating lease liabilities $ 132.9 132.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current operating lease liabilities  
Total lease liabilities $ 148.1 $ 144.6