Intangible Assets - Changes in Carrying Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Finite-lived Intangible Assets [Roll Forward]
Gross Carrying Amount, Beginning Balance	$ 1,844.8
Accumulated Amortization, Beginning Balance	(795.1)
Net Carrying Amount, Beginning Balance	1,049.7
Amortization expense	(32.8)	$ (30.9)
Gross Carrying Amount, Ending Balance	1,844.8
Accumulated Amortization, Ending Balance	(827.9)
Net Carrying Amount, Ending Balance	$ 1,016.9