CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other comprehensive (loss) income:
Income tax expense (benefit) on translation adjustments on derivative instruments	$ 3.8	$ 10.2	$ (34.3)
Income tax expense (benefit) on unrealized gain (loss) on investments			(0.8)
Income tax expense on defined benefit pension plans and retiree health care plan	$ (8.1)	$ 4.6	$ (0.1)