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Leases - ROU Asset and Lease Liability (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Assets    
Operating lease ROU assets $ 150.5 $ 164.7
Liabilities    
Operating lease current liabilities 26.3 31.5
Operating lease noncurrent liabilities $ 152.8 $ 163.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position us-gaap:OtherAssetsNoncurrent  
Operating Lease, Liability, Current, Statement of Financial Position us-gaap:AccruedLiabilitiesCurrent  
Operating Lease, Liability, Noncurrent, Statement of Financial Position us-gaap:OtherLiabilitiesNoncurrent