Income Taxes - Income Tax Benefit (Expense) from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current Income Tax Benefit (Expense)	$ 122.7	$ (86.6)	$ (66.4)
Deferred Income Tax Benefit (Expense)	2.1	(13.6)	(68.5)
(Increase) Decrease Unrecognized Tax Benefits	0.0	0.0	4.4
Income Tax Benefit (Expense)	$ 124.8	$ (100.2)	$ (130.5)