Supplementary Data Other (Expense) Income , Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Net losses on sales of businesses and investments	$ (13.1)	$ (2.2)	$ (12.1)	$ (18.5)
Other (expense) income, net	(2.3)	2.6	(2.5)	(0.3)
Total other (expense) income, net	$ (15.4)	$ 0.4	$ (14.6)	$ (18.8)