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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, weighted average grant date fair value (in dollars per share)     $ 56.40 $ 67.61
Long Term Performance Restricted Stock Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility 0.00% 0.00% 31.30% 28.00%
Risk-free interest rate 0.00% 0.00% 2.50% 2.20%
Expected term (years)     1 year 7 months 6 days 2 years 1 month 6 days
Granted, weighted average grant date fair value (in dollars per share) $ 0 $ 0 $ 60.91 $ 78.56