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Summary of Significant Accounting Policies Discussion Adoption of ASU 2014-09 (Details) - Successor - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Investments and other assets |  | $ 212.6 | $ 470.6
Retained earnings |  | 1,074.5 | 613.6
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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