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Net Income (Loss) Per Share (Anti-Dilutive Shares Issuable) (Details) - shares
shares in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 7.9 18.7
Conversion of Notes    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 0.3 0.0
Share purchase options    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 5.3 17.0
Restricted Stock and Restricted Share Units (RSUs)    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 0.3 0.2
Other issuable shares    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 2.0 1.5