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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - $ / shares
shares in Thousands
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 25,561 29,080  
Stock Options      
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 14,899 12,215  
Stock options outstanding, average exercise price (in usd per share) $ 24.60 $ 22.22  
Restricted Share Units (RSUs) - Unvested      
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 1,676 1,662  
Share Purchase Options and Restricted Share Units      
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 2,885 7,163  
Convertible Senior Subordinated Notes | April 2009 Notes      
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 0 1,984  
Conversion price per share (in usd per share)   $ 8.15  
Convertible Senior Subordinated Notes | January 2012 Notes      
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 4,063 4,032  
Conversion price per share (in usd per share) $ 10.30 $ 10.38  
Convertible Senior Subordinated Notes | April 2013 Notes      
Common Shares Reserved For Future Issuance [Line Items]      
Shares reserved for future issuance (in shares) 2,038 2,024  
Conversion price per share (in usd per share) $ 29.44 $ 29.65  
April 2009 Notes | Convertible Senior Subordinated Notes      
Common Shares Reserved For Future Issuance [Line Items]      
Coupon rate 3.625% 3.625% 3.625%
January 2012 Notes | Convertible Senior Subordinated Notes      
Common Shares Reserved For Future Issuance [Line Items]      
Conversion price per share (in usd per share) $ 10.30    
Coupon rate 4.00%    
April 2013 Notes | Convertible Senior Subordinated Notes      
Common Shares Reserved For Future Issuance [Line Items]      
Conversion price per share (in usd per share) $ 29.44    
Coupon rate 1.25%