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Basis of Preparation - Operating Lease Future Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Future minimum lease payments    
2019 $ 1.9 $ 7.9
2020 7.1 6.9
2021 6.4 5.7
2022 6.1 5.3
2023 5.5 4.6
Thereafter 13.1 9.2
Total future minimum lease payments $ 40.1 $ 39.6