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Commitments and Contingencies - Future Minimum Lease Commitments Under Non-cancelable Operating Leases (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
Q3 through Q4 2019 | $ 12.7 | $ 23.2
2020 | 21.4 | 17.6
2021 | 17.0 | 13.3
2022 | 14.5 | 11.1
2023 | 12.2 | 9.5
Thereafter | 18.9 | 13.8
Total lease payments | 96.7 | $ 88.5
Less: imputed interest | (14.8) |
Total | $ 81.9 |

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