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Leases - Table 2 (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease right-of-use assets $ 284.9 $ 0.0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet  
Finance lease, Property and equipment, net $ 344.0  
Total leased assets 628.9  
Current operating lease liabilities $ 48.3 0.0
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent  
Finance lease, Current portion of long-term debt $ 18.2  
Long-term operating lease liabilities $ 245.0 $ 0.0
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations  
Finance lease, long-term debt, net of current portion $ 381.9  
Total lease liabilities $ 693.4