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Net Income (Loss) Per Share (Anti-Dilutive Shares Issuable) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 10.0 14.1 13.4 10.2
Conversion of Notes        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 0.0 6.2 0.0 6.1
Share purchase options        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 8.7 2.7 12.0 2.3
Restricted Stock and Restricted Share Units (RSUs)        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 0.2 0.2 0.2 0.1
Other issuable shares        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 1.1 5.0 1.2 1.7