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Stock-Based Compensation Long-Term Performance Restricted Stock Unit Award Monte Carlo Pricing Model Assumptions (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average fair value [1] $ 40.02 $ 35.30
Long Term Performance Restricted Stock Award [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Expected volatility 30.00% 30.10%
Risk-free interest rate 0.70% 0.70%
Expected term (years) 1 year 10 months 2 years 1 month
Weighted average fair value $ 44.77 $ 33.46
[1] Restricted stock units granted in 2015 and 2016 do not include awards under the Performance Award Agreement for the respective years, as these awards are not granted until attainment of annual performance goals has been determined at the conclusion of the performance period, which had not occurred as of March 31, 2015 and 2016, respectively.