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Stockholders' Equity Successor Preferred Stock Activity (Details) - Successor - shares
shares in Millions
9 Months Ended
Dec. 31, 2017
Apr. 01, 2017
Class of Stock [Line Items]    
Preferred Stock, shares outstanding 13.5 30.0
Conversion of Stock, Shares Converted (17.2)  
Preferred Stock Dividends, Shares 0.7