Supplementary Data Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Abstract]
Net losses on sales of businesses	$ (3.2)	$ (19.8)	$ (11.8)	$ (44.2)
Other Nonoperating Income	(0.6)	3.5	1.1	3.5
Total other expense, net	$ (3.8)	$ (16.3)	$ (10.7)	$ (40.7)