Divestitures and Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Sales		$ 0.0		$ 349.3
Cost of sales		0.0		262.9
Other costs and expenses		2.0		99.5
Loss from discontinued operations before income taxes		(2.0)		(13.1)
Income tax benefit		1.5		(1.2)
Loss from discontinued operations, net of tax		(3.5)	$ 0.0	(11.9)
Impairment of discontinued operations		0.0		187.8
Income tax benefit		0.6		(45.0)
Impairment of discontinued operations, net of tax		0.6	0.0	142.8
Net loss from discontinued operations	$ 0.0	$ (4.1)	$ 0.0	$ (154.7)