Income Taxes - Schedule of Income from Operations Before Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 8.2	$ 196.4	$ 234.2
Foreign	(0.2)	0.0	(0.3)
Income from continuing operations before provision for income taxes	$ 8.0	$ 196.4	$ 233.9