XML 136 R80.htm IDEA: XBRL DOCUMENT v3.8.0.1
Expenses By Nature (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis of income and expense [abstract]      
Employee-related costs $ 726.4 $ 711.3 $ 690.9
Employee stock-based compensation expense 30.1 33.0 37.6
Freight and transportation costs 79.3 80.9 76.8
Depreciation expense 67.6 66.2 59.1
Rental expense $ 28.5 $ 27.1 $ 25.6