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Common Stock (Share-Based Compensation and Treasury Stock) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
Jan. 22, 2013
Nov. 30, 2012
Jun. 30, 2012
Nov. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Defined Contribution Plan, Employer Matching Contribution, Percent of Match         0.00%    
Non-cash share-based compensation expense         $ 10.9 $ 13.4 $ 7.4
Common stock shares purchased by the company         448,121 166,334  
Return of borrowed shares under share-based, shares 2,439,558   659,340 701,102 2,439,558 659,340  
Stock repurchase shares authorized   $ 25          
Defined Contribution Plan, Employer Matching Contribution, Percent         2.00%    
Restricted Stock [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 15.17 $ 11.03 $ 8.79
Treasury Stock [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock shares purchased by the company         448,000 166,000 81,000
Stock surrendered for exercise of stock options, shares         237,000