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Commitment and Contingencies - Lease Assets and Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Operating lease right-of-use assets $ 68.3 $ 74.9
Operating lease liabilities - current 21.5 20.9
Operating lease liabilities - long-term 53.1 59.7
Total lease liabilities $ 74.6 $ 80.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term liabilities: Long-term liabilities: