Discontinued Operations - Transition Services Agreement (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) agreement item	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Discontinued Operations
Other income, net		$ 1.5	$ 1.9	$ 15.7	$ 2.4
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		$ 1.3		$ 14.8