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Financing Obligations - Obligations (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Financing Obligatons $ 2,174.3
Less: Current maturities $ (2.7)
Capital Lease Obligations  
Debt Instrument [Line Items]  
Weighted average effective interest rate 4.62%
Financing Obligatons $ 118.2
Unamortized Financing Issuance Costs (2.6)
Total financing obligations 115.6
Less: Current maturities (2.7)
Financing obligations, net $ 112.9