Supplementary Data Other (Expense) Income , Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Income and Expenses [Abstract]
Net (losses) gains on sales of businesses and investments	$ (6.2)	$ 3.9	$ (18.3)	$ (14.6)
Other (expense) income, net	(3.7)	1.4	(6.2)	1.1
Total other (expense) income, net	$ (9.9)	$ 5.3	$ (24.5)	$ (13.5)