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Net Income Per Share (Anti-Dilutive Shares Issuable) (Details) - shares
shares in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 18.7 17.7
Conversion of Notes    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 0.0 6.2
Share purchase options    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 17.0 9.4
Restricted Stock and Restricted Share Units (RSUs)    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 0.2 0.9
Other Issuable Shares    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 1.5 1.2