Supplementary Data Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Net losses on sales of businesses	$ (19.8)	$ (13.1)	$ (44.2)	$ (12.2)
Other	3.5	(2.3)	3.5	(2.4)
Total other expense, net	$ (16.3)	$ (15.4)	$ (40.7)	$ (14.6)