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Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented - Adjustments Due to ASC 606 (Details) - Successor - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Investments and other assets |  | $ 276.4 | $ 470.6
Adjustments due to ASU 2014-09 |  | $ (22.5) |
Investments and other assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Investments and other assets | $ 448.1 |  | 470.6
Adjustments due to ASU 2014-09 | (22.5) |  |
Retained earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | 591.1 |  | $ 613.6
Adjustments due to ASU 2014-09 | $ (22.5) |  |

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