Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross carrying value		$ 3,171.5	$ 2,992.5
Accumulated amortization		(1,550.7)	(1,397.3)
Net carrying value		1,620.8	1,595.2
Foreign currency translation, Gross carrying value		33.5	(4.5)
Foreign currency translation, Accumulated amortization		(2.0)	0.4
Foreign currency translation, Net carrying value		31.5	(4.1)
Purchased Customer Accounts
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, excluding foreign currency translation		3,138.0	2,997.0
Accumulated amortization, excluding foreign currency translation		(1,548.7)	(1,397.7)
Net carrying value, excluding foreign currency translation		$ 1,589.3	$ 1,599.3
Weighted average life (years)	[1]	14 years 9 months 18 days	14 years 9 months 18 days

[1] Weighted average life calculated as of the date of acquisition.