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Leases - Future Minimum Capital Lease Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Capital Leased Assets [Line Items]  
2018 $ 22.1
2019 23.2
2020 12.0
Total minimum lease payments 57.3
Less amount representing interest (at a weighted-average interest rate of 4.02%) (3.6)
Total capital lease obligations $ 53.7
Capital Lease Obligations  
Capital Leased Assets [Line Items]  
Weighted average effective interest rate 4.62%
Capital Leases | Capital Lease Obligations  
Capital Leased Assets [Line Items]  
Weighted average effective interest rate 4.02%