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Leases - Balance Sheet Effect (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease right-of-use assets $ 304.3 $ 245.4
Finance lease assets 61.2 54.4
Total leased assets 365.5 299.8
Operating leases obligations 61.0 50.8
Finance lease obligations 11.4 8.2
Long-term operating lease obligations 275.1 205.4
Finance lease obligations 60.0 55.9
Present value of lease obligations $ 407.5 $ 320.3
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtNoncurrent us-gaap:LongTermDebtNoncurrent