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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