Supplementary Data Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income and Expenses [Abstract]
Gains (losses) on sales of businesses and investments	$ 3.9	$ (37.6)	$ (14.6)	$ (37.8)
Other income, net	2.2	0.4	3.5	1.4
Total other income (expense), net	$ 6.1	$ (37.2)	$ (11.1)	$ (36.4)