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LEASES (Lease Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]      
Operating lease right of use assets $ 836.5 $ 306.4 $ 250.0
Finance Lease, Right-of-Use Asset 80.4 24.2  
Lease, Right of Use Asset 916.9 330.6  
Current operating lease liabilities 78.4 72.1  
Finance lease liabilities 14.4 6.5  
Long-term operating lease liabilities 756.0 233.1  
Finance Lease, Liability, Noncurrent 68.3 18.4  
Total lease liabilities $ 917.1 $ 330.1