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Commitments and Contingencies Operating Lease Commitments (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Operating Lease Commitments [Abstract]  
Three months ended December 31, 2018 $ 2.3
2019 7.9
2020 6.4
2021 4.2
2022 3.2
Thereafter 24.2
Total $ 48.2