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Leases - Components of Right-of-us Assets and Liabilities Related to Leases (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
option_to_renew
Dec. 31, 2019
USD ($)
Leases [Abstract]    
Initial term of operating leases 10 years  
Number of options to renew operating leases | option_to_renew 1  
Unusual or Infrequent Item, or Both [Line Items]    
Increase in right-of-use operating lease assets and liabilities $ 62.1 $ 56.2
Assets:    
Operating lease assets $ 310.1 $ 297.7
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance lease assets $ 258.1 $ 237.1
Total leased assets $ 568.2 $ 534.8
Operating lease liabilities:    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Current $ 39.2 $ 37.3
Long-term 300.9 283.1
Total operating lease liabilities $ 340.1 $ 320.4
Finance lease liabilities:    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Current $ 18.9 $ 15.8
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations
Long-term $ 262.3 $ 237.6
Total finance lease liabilities 281.2 253.4
Total lease liabilities $ 621.3 $ 573.8
Weighted-average remaining lease term, operating leases 8 years 10 months 24 days 8 years 10 months 24 days
Weighted-average remaining lease term, finance leases 15 years 10 months 24 days 16 years 7 months 6 days
Weighted-average discount rate, operating leases 10.30% 10.40%
Weighted-average discount rate, finance leases 9.20% 8.70%
COVID-19 Pandemic    
Unusual or Infrequent Item, or Both [Line Items]    
Increase in right-of-use operating lease assets and liabilities $ 27.4