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Debt (Conversions of Convertible Senior Subordinated Notes) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal amount converted $ 0 $ 16
Convertible Senior Subordinated Notes | April 2009 Notes    
Debt Instrument [Line Items]    
Principal amount converted   $ 16
Common shares issued upon conversion (in shares)   2
Weighted average conversion price per share (in usd per share)   $ 8.15
Coupon rate   3.625%