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Income Taxes - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Apr. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2018
Successor |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax provision (benefit) | $ 13.8 | $ (84.1) |  | $ (79.4) | $ 31.3
Successor | Foreign Tax Authority |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax provision (benefit) | $ 0.3 | $ (0.9) |  | $ (1.0) | $ 0.2
Predecessor |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax provision (benefit) |  |  | $ (263.8) |  |
Predecessor | Foreign Tax Authority |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax provision (benefit) |  |  | $ (9.4) |  |

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