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Share-Based Compensation Share-Based Compensation Assumptions Used (Details) - Stock Compensation Plan - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair market value $ 77.38 $ 64.99 $ 42.45
Option price $ 73.51 $ 61.74 $ 40.33
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility 41.00% 31.00% 19.00%
Risk free interest rate 0.02% 0.05% 0.05%
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected weighted-average life 3 months    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected weighted-average life 1 year