XML 119 R102.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock Plans (Details 2) - Stock Option [Member] - $ / shares
2 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted Average Assumptions Used        
Dividend yield 1.58% 1.40% 1.80% 1.90%
Expected volatility 21.41% 22.00% 24.00% 25.00%
Risk-free interest rate 2.26% 2.70% 2.30% 1.50%
Expected life of stock option (in years) 7 years 7 years 1 month 6 years 9 months 6 years 3 months
Weighted-average fair value per option $ 19.18 $ 23.17 $ 18.18 $ 13.67