v3.20.4
LEASES - Cash flow information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows used in finance leases $ (3.2) $ (7.6)  
Operating cash flows used in operating leases (446.5) (941.6)  
Financing cash flows used in finance leases (6.2) (10.9) $ (71.0)
Landlord contributions:      
Operating cashflows provided by operating leases 43.6 106.5  
Supplemental disclosure of noncash leasing activities:      
Right-of-use assets obtained in exchange for new operating lease liabilities $ 201.5 $ 463.2