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Stock-Based Employee Compensation (Monte Carlo Assumptions) (Details) - Market-Based Stock Units - $ / shares
Jun. 15, 2015
Jun. 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated fair value $ 33.08 $ 21.00
Expected volatility (percent) 41.22% 34.60%
Expected term (in years) 1 year 9 months 18 days 1 year 9 months 18 days
Risk-free interest rate (percent) 0.65% 0.38%
Dividend yield (percent) 0.00% 0.00%