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Stock-Based Compensation (Details )
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
May 31, 2013
Apr. 30, 2011
Dec. 31, 2013
Stock options
Dec. 31, 2013
Stock options
Maximum
Dec. 31, 2013
Stock options
Minimum
Dec. 31, 2013
Restricted Shares and Restricted Share Units
Maximum
Dec. 31, 2013
Restricted Shares and Restricted Share Units
Minimum
Stock-Based Compensation                
Shares authorized for issuance under share-based compensation plan   6.6 4.8          
Shares authorized for issuance under share-based compensation plan prior to amendment   4.8 3.8          
Shares available for grant 1.7              
Vesting rights (as a percent)       20.00%        
Option expiration period         10 years 8 years    
Vesting period             5 years 3 years