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Stock-Based Compensation - Additional Information (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
item
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Dividends paid $ 38,300,000 $ 0 $ 0  
Unrecognized compensation cost 3,500,000      
Cash received from stock option exercises and employee stock purchases 9,800,000      
Cash used for shares withheld to satisfy employee tax obligations for NQOs exercised and RSUs converted 6,400,000      
Tax benefit from stock options exercised during the period $ 83,000,000 89,300,000 $ 76,000,000  
Shares authorized for future grant under stock plan (in shares) | shares 2,800,000      
Non-qualified stock options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options vesting period 3 years      
Options expiration period 10 years      
Period of historical option activity considered to determine expected option life 10 years      
Number of separate employee groups | item 2      
Unrecognized compensation cost $ 1,200,000 $ 1,100,000    
Tax benefit from stock options exercised during the period $ 9,200,000      
Non-qualified stock options | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 1 year      
Non-qualified stock options | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 3 years      
RSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares outstanding | shares 462,556 500,000 600,000 800,000
RSUs | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 1 year      
RSUs | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 3 years      
PRSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares outstanding | shares 441,599 400,000 500,000 500,000
Unrecognized compensation cost $ 2,200,000      
Performance period 3 years 3 years 3 years  
PRSUs | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 1 year      
Performance period 3 years      
Current projections and performance targets estimated additional performance shares issuable | shares 100,000      
PRSUs | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 3 years      
Employee stock purchase plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum contribution by eligible employees as percentage of base earnings (as a percent) 10.00%      
Maximum contribution by eligible employees in a calendar year $ 25,000      
Common stock purchase price as percentage of fair market value (as a percent) 85.00%      
Shares purchased under employee stock purchase plan (in shares) | shares 34,468 28,453