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Summary of Significant Accounting Policies Discussion Adoption of ASU 2014-09 (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Investments and other assets | $ 212.6 | $ 139.1
Retained earnings | 1,074.5 | $ 597.0
Adjustments due to ASU 2014-09 | $ 22.5 |

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