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Commitments and Contingencies - Operating Lease Commitments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2018 $ 6.0
2019 5.8
2020 5.1
2021 4.6
2022 4.1
Thereafter 18.5
Operating leases, future minimum payments due 44.1
Third Parties  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2018 3.5
2019 3.3
2020 2.6
2021 2.1
2022 1.6
Thereafter 9.4
Operating leases, future minimum payments due 22.5
Related Entity  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2018 2.5
2019 2.5
2020 2.5
2021 2.5
2022 2.5
Thereafter 9.1
Operating leases, future minimum payments due $ 21.6