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Stockholders' Equity Successor Common Stock Activity (Details) - Successor - shares
shares in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Schedule of Common Stock Activity [Line Items]    
Shares outstanding at the beginning of the period 70.9 105.2
Shares issued for preferred share conversions 33.8 25.5
Shares issued for warrant conversions 6.2 0.0
Shares issued for vested restricted stock units 0.1 0.7
Stock Issued During Period, Shares, Shares Issued for Disputed Claims 0.0 0.1
Shares repurchased (5.8) (21.1)
Shares outstanding at the end of the period 105.2 110.4