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Stockholders' Equity Successor Common Stock Activity (Details) - Successor
shares in Millions
 9 Months Ended
Dec. 31, 2017
shares
Schedule of Common Stock Activity [Line Items]  
Stock Issued During Period, Shares, Conversion of Convertible Securities 33.8
Shares outstanding at the beginning of the year 70.9
Conversion of Stock, Shares Issued 6.2
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 0.1
Shares outstanding at the end of the year 105.2
Stock Repurchased During Period, Shares (5.8)