Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ (20.0)	$ 3.3	$ 30.0
State	9.0	19.9	5.9
Foreign	3.5	11.0	3.6
Total current expense (benefit)	(7.5)	34.2	39.5
Deferred:
Federal	24.4	(24.7)	102.7
State	(0.4)	(4.7)	(9.3)
Foreign	1.5	0.2	(0.1)
Total deferred expense (benefit)	25.5	(29.2)	93.3
Total tax expense (benefit)	18.0	5.0	132.8
Other comprehensive income (loss), tax		0.4	0.8
Income tax expense (benefits) from discontinued operations
Tax expense related to GILTI tax	0.5	0.7
Income tax expense (benefit) on gain (loss) disposal of discontinued operations	0.0	0.0	(0.1)
Reductions related to lapses of statutes of limitations	40.8	47.9
Net operating loss carryforwards utilized	$ 0.4	$ 0.4	$ 1.2