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Share-Based Payments - Textual (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Oct. 31, 2013
Jul. 31, 2013
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2008
2008 Equity incentive plan [Member]
May 31, 2011
2008 Amended and Restated Equity Incentive Plan [Member]
Dec. 31, 2013
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Share-based Compensation (Textual) [Abstract]                                  
Share-based Compensation Plan, Shares Authorized             6,000,000 9,000,000                  
Common Stock, Dividends, Per Share, Declared $ 0.18 $ 0.18 $ 0.18 $ 0.36 $ 0.00 $ 0.00                      
Share-based Compensation, Options, Grants in Period, Weighted-Average Fair Value                 $ 10.96 $ 9.57 $ 11.27            
Share-based Compensation Expense                 $ 2.1 $ 2.0 $ 1.7 $ 21.6 $ 21.2 $ 17.7 $ 1.2 $ 0.9 $ 0.9
Share-based Compensation, Unrecognized Expense                 2.1     22.0     0    
Share-based Compensation, Unrecognized Expense, Time Period Expected to be Recognized                 19 months     20 months          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value                 1.9 0.1 0.8            
Share-based Compensation, Restricted Stock Awards, Grants in Period, Weighted Average Fair Value                       $ 23.55 $ 19.30 $ 8.23      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value                       $ 15.7 $ 34.0 $ 12.5      
Share-based Compensation Plan, Restricted Stock Units, Issued in Period                             53,011 42,903 37,332
Share-based Compensation Plan, Restricted Stock Units, Issued in Period, Weighted Average Grant Date Fair Value                             $ 22.47 $ 20.98 $ 24.11
Share-based Compensation Plan, Number of Shares Available for Grant                             357,308