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Stock-Based Incentive Plan (Valuation Assumptions) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Volatility 29.40%
Risk-free interest rate 1.60%
Expected term (years) 5 years
Performance awards
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Forfeiture rate 5.50%
Weighted average grant date fair value $ 34.58
Stock appreciation rights
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average grant date fair value $ 9.43