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Leases - Lease Expense and Cash Flow Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
Operating lease costs $ 56.6 $ 54.9
Finance lease costs:    
Amortization of leased assets 20.4 19.0
Interest on lease liabilities 18.9 15.7
Total finance lease costs 39.3 34.7
Variable and short-term lease costs 15.0 12.6
Total lease costs 110.9 102.2
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases 55.2 49.8
Operating cash outflows from finance leases 18.0 15.7
Financing cash outflows from finance leases 15.8 12.9
Right-of-use assets obtained in exchange for operating lease obligations 44.9 53.9
Right-of-use assets obtained in exchange for finance lease obligations $ 10.1 $ 11.5