Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Narrative) (Details)

v2.4.0.8
Earnings Per Share (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock repurchase plan, authorized amount     $ 500,000,000  
Aggregate shares repurchased under stock repurchase plan (in shares)     19,241,156  
Stock purchase value     443,400,000  
Stock repurchased during period, shares     54,600  
Stock repurchased during period, value     1,957,000  
Repurchase of common stock not yet paid   $ 0 $ 1,950,000  
Stock Options And Service-Based Restricted Stock Units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share, number of shares 467,288 787,986 380,716 1,172,440
Performance-Based Restricted Stock Units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share, number of shares 140,596 21,120 107,347 21,120