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Leases - Lease Expense and Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]    
Operating lease costs $ 37.5 $ 36.3
Finance lease costs:    
Amortization of leased assets 13.8 12.0
Interest on lease liabilities 12.6 10.4
Total finance lease costs 26.4 22.4
Variable and short-term lease costs 9.8 8.3
Total lease costs 73.7 67.0
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases 36.7 33.7
Operating cash outflows from finance leases 11.9 10.4
Financing cash outflows from finance leases 10.6 8.3
Right-of-use assets obtained in exchange for operating lease obligations 31.4 37.5
Right-of-use assets obtained in exchange for finance lease obligations $ 6.6 $ 8.5