Discontinued Operations - Transition Services Agreement (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) agreement item	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Discontinued Operations
Other income (loss), net		$ 6.3	$ (0.1)	$ 14.2	$ 0.5
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 (loss), net		$ 5.4		$ 13.5