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Leases - Summary of Balances of Right of Use Assets and Liabilities of Finance Leases and Operating Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Right-of-use assets    
Operating leases, gross $ 52.7 $ 42.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent
Finance leases, gross $ 51.8 $ 48.8
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentGross
Current:    
Operating leases $ 12.0 $ 7.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Finance leases $ 12.1 $ 12.2
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LiabilitiesCurrent us-gaap:LiabilitiesCurrent
Non-current:    
Operating leases $ 46.2 $ 47.2
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Finance leases $ 18.7 $ 25.8
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LiabilitiesNoncurrent us-gaap:LiabilitiesNoncurrent