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Equity (Valuation Assumptions) (Details) - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Equity [Abstract]    
Risk-free interest rate 1.51% 1.08%
Expected life in years 5 years 5 years
Expected volatility 24.00% 24.00%
Expected dividend yield 1.36% 1.25%
Estimated weighted-average fair value of options granted per share $ 49.39 $ 40.94