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Leases - Components of Lease Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 68.5 $ 72.9
Finance lease cost:    
Amortization of right-of-use assets 32.1 30.3
Interest on lease liabilities 29.3 29.5
Total finance lease cost 61.4 59.8
Short-term and variable lease cost 3.7 1.5
Sublease income (3.2) (3.2)
Total lease cost $ 130.4 $ 131.0