Intangible Assets - Changes in Carrying Value (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount, beginning balance			$ 1,844.8
Accumulated amortization, beginning balance			(923.6)
Net carrying amount, beginning balance			921.2
Amortization expense	$ (31.9)	$ (31.9)	(95.7)	$ (96.6)
Gross carrying amount, ending balance	1,844.8		1,844.8
Accumulated amortization, ending balance	(1,019.3)		(1,019.3)
Net carrying amount, ending balance	$ 825.5		$ 825.5