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Leases - Schedule of Lease-Related Liabilities Recorded on the Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating lease liabilities:    
Current portion included in accrued liabilities $ 30.8 $ 25.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Noncurrent operating lease liabilities $ 246.7 $ 238.5
Total operating lease liabilities 277.5 263.7
Finance lease liabilities:    
Current portion included in current maturities of long-term debt $ 6.0 $ 1.1
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:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations
Long-term portion of lease liabilities in long-term debt $ 240.4 $ 29.4
Total financing lease liabilities 246.4 30.5
Total lease liabilities 523.9 $ 294.2
Total finance lease right-of-use assets $ 253.9  
Weighted-average remaining lease term:    
Weighted-average remaining lease term, operating leases 5 years  
Weighted-average remaining lease term, finance leases 12 years  
Weighted-average discount rate:    
Weighted-average discount rate, operating leases 4.69%  
Weighted-average discount rate, finance leases 4.12%