XML 132 R99.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation Programs - Compensation expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-Based Compensation Programs      
Share based compensation expense $ 46.0 $ 35.0 $ 25.0
Expenses for share-based compensation arrangements, after tax 35.0 $ 22.0 $ 15.0
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 89.0    
Expected weighted-average period for recognition of unrecognized stock-based compensation costs 2 years 3 months 18 days    
Special Acquisition Related Incentive Plan | Business consolidation and other activities      
Stock-Based Compensation Programs      
Share based compensation expense $ 11.0