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Leases - Lease Expense and Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating lease costs $ 74.1 $ 70.4
Finance lease costs:    
Amortization of leased assets 26.2 22.2
Interest on lease liabilities 22.2 13.0
Total finance lease costs 48.4 35.2
Variable and short-term lease costs 16.9 13.2
Total lease costs 139.4 118.8
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases 68.1 67.3
Operating cash outflows from finance leases 20.7 13.0
Financing cash outflows from finance leases 18.3 13.4
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases 62.1 56.2
Finance leases 47.0 133.3
Noncontrolling Interest    
Finance lease costs:    
Rent paid under finance lease agreement, allocated to principal and interest 6.9 6.7
Investor    
Lessee, Lease, Description [Line Items]    
Operating lease costs $ 22.8 $ 20.6