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Share-Based Compensation and Equity Share-Based Compensation and Equity - Non-Employee Share-based Compensation (Details) - $ / shares
shares in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2005
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life (in years)   6 years 5 years 6 years
Non-employee Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of securities called by warrants or rights 0.1      
Exercise price $ 46.00      
Warrants issued grant date fair value $ 14.66      
Risk free interest rate 4.45%      
Expected dividend yield 1.63%      
Expected volatility rate 30.00%      
Expected life (in years) 6 years