Income Taxes - Operating Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating loss carryforwards
Income tax payable	$ 0.7	$ 2.7
State and Local Jurisdiction
Operating loss carryforwards
Operating loss carryforwards	229.3	304.0
Domestic Tax Authority
Operating loss carryforwards
Operating loss carryforwards	$ 3.1	$ 2.3