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Net Income (Loss) Per Share (Anti-Dilutive Shares Issuable) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 8.3 11.5 8.2 15.0
Conversion of Notes        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 0.0 0.0 0.2 0.0
Share purchase options        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 5.0 10.3 5.1 13.6
Restricted Stock and Restricted Share Units (RSUs)        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 0.3 0.1 0.3 0.1
Other issuable shares        
Anti-dilutive shares issuable [Line Items]        
Anti-dilutive shares issuable (in shares) 3.0 1.1 2.6 1.3