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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other comprehensive income (loss):      
Income tax expense (benefit) on translation adjustments on net investment hedge $ (34.3) $ 8.4 $ 19.2
Income tax expense (benefit) on unrealized gain (loss) on investments (0.8) 0.4 0.1
Income tax expense (benefit) on defined benefit pension plans and retiree health care plan $ (0.1) $ (5.8) $ 7.8