Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other comprehensive loss:
Income tax expense (benefit) on translation adjustments on net investment hedge	$ (3.2)	$ (0.4)	$ (8.8)	$ 11.4
Income tax expense (benefit) on unrealized gain on investments	0.2	(0.1)	0.3	(0.4)
Income tax expense (benefit) on defined benefit pension plans and retiree health care plan	$ (1.0)	$ 0.2	$ (1.3)	$ 0.7