Discontinued Operations - Transition Services Agreement (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) item agreement	Dec. 31, 2020 USD ($)
Discontinued Operations
Other income, net	$ 16.6	$ 9.5	$ 1.3
Transition Services Agreement
Discontinued Operations
Number of separate agreements | agreement		2
Agreement term		12 months
Number of optional term extensions | item		2
Period of optional term extension		3 months
Amount of employee service, processes or systems expense allocated to discontinued operations		$ 0.0
Other income, net	$ 15.6	$ 8.5