Supplementary Data Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Net losses on sales of businesses	$ (7.7)	$ (5.8)	$ (19.5)	$ (50.0)
Other Nonoperating Income	0.3	(9.5)	1.4	(6.0)
Total other expense, net	$ (7.4)	$ (15.3)	$ (18.1)	$ (56.0)