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LEASES - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2021
May 31, 2021
Dec. 31, 2020
LEASES      
Operating lease right of use assets $ 113.7   $ 111.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent    
Current operating leased liabilities $ 13.5   12.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts Payable and Accrued Liabilities, Current    
Non-current operating lease liabilities $ 134.0   132.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current operating lease liabilities    
Total lease liabilities $ 147.5 $ 9.5 $ 144.6