Supplementary Data Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Net losses on sales of businesses	$ (5.8)	$ (8.7)	$ (50.0)	$ (20.9)
Other	(9.5)	(1.2)	(6.0)	(3.6)
Total other expense, net	$ (15.3)	$ (9.9)	$ (56.0)	$ (24.5)