Supplementary Data Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expenses [Abstract]
Net losses on sales of businesses	$ (8.6)	$ (24.4)
Other	1.7	0.0
Total other expense, net	$ (6.9)	$ (24.4)