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LEASES - Lease Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease expense $ 57.3 $ 54.4
Finance lease expense amortization of leased assets 1.2 1.1
Short-term and variable lease expense 0.1 0.6
Sublease income (0.4) (0.5)
Total $ 58.2 $ 55.6