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Stock Based Compensation - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2014
2003 Long-Term Incentive Plan [Member]
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2014
Non-Vested Restricted Stock And Restricted Stock Unit Awards(RSUs) [Member]
Sep. 30, 2014
Maximum [Member]
Employee Restricted Stock Units(RSUs) [Member]
Sep. 30, 2014
Maximum [Member]
Non-Employee Restricted Stock Units(RSUs) [Member]
Sep. 30, 2014
Minimum [Member]
Employee Restricted Stock Units(RSUs) [Member]
Sep. 30, 2014
Minimum [Member]
Non-Employee Restricted Stock Units(RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Derivatives used in Net Investment Hedge, Net of Tax   $ 2.3                      
Shares authorized       2,040,897                  
Shares available for grant       1,570,776                  
Minimum number of months nonemployment required for grants on nonqualified stock options to directors 12 months                        
Number of RSUs granted                 136,949        
Requisite service period of the award               3 years   5 years 2 years 2 years 1 year
Compensation expense         0.3 1.1 1.4            
Total recognized tax benefit         0.1 0.4 0.5            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                 $ 9.49        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value                 $ 26.64        
Unearned compensation expense                 $ 0.8        
Weighted average period of unearned compensation expense related to non-vested restricted stock and RSU awards cost is expected to be recognized                 1 year 11 months 5 days        
Options outstanding     2,500