Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current	$ 27.7	$ 16.9	$ 31.5
Deferred	4.4	9.4	20.5
Total income tax expense	$ 32.1	$ 26.3	$ 52.0