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Stockholders' Equity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 09, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2016
Jan. 30, 2015
Stockholders' equity          
Compensation cost not yet recognized       $ 4,000,000  
2015 Stock Incentive Plan          
Stockholders' equity          
Common stock reserved for issuance (in shares)       1,275,000  
Maximum number of shares that may be issued through the exercise of incentive stock options       750,000  
2015 Stock Incentive Plan | Nonvested stock units issued (NSUs)          
Stockholders' equity          
Vesting rights percent       33.33%  
Number of shares granted       19,000  
Award vesting period of the grants       3 years  
Weighted average grant date fair value (in USD per share)       $ 57.02  
2015 Stock Incentive Plan | Time-based equity award          
Stockholders' equity          
Number of shares granted       51,000  
Award vesting period of the grants       3 years  
Weighted average grant date fair value (in USD per share)       $ 56.64  
2015 Stock Incentive Plan | Time-based equity award | Subsequent event          
Stockholders' equity          
Number of shares granted 25,000,000        
Weighted average grant date fair value (in USD per share) $ 59.75        
2015 Employee Stock Purchase Plan          
Stockholders' equity          
Common stock reserved for issuance (in shares)     1,000,000    
Employee stock purchase plan, purchase period   6 months      
Employee stock purchase plan discount     15.00%    
2015 Stock Repurchase Program          
Stockholders' equity          
Maximum stock repurchase amount approved by Board of Directors         $ 200,000,000
Treasury stock, number of shares held       1,797,000,000  
Treasury stock acquired, average cost per share (in USD per share)       $ 67.95  
Treasury stock, value       $ 122,100,000  
Remaining stock repurchase amount approved by Board of Directors       $ 77,900,000