Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Foreign currency translation, Gross carrying value		$ 2.3	$ (4.5)
Gross carrying value		3,053.0	2,992.5
Foreign currency translation, Accumulated amortization		0.1	0.4
Accumulated amortization		(1,521.3)	(1,397.3)
Foreign currency translation, Net carrying value		2.4	(4.1)
Net carrying value		1,531.7	1,595.2
Purchased Customer Accounts and Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, excluding foreign currency translation		3,010.4	2,957.7
Accumulated amortization, excluding foreign currency translation		(1,486.0)	(1,363.7)
Net carrying value, excluding foreign currency translation		$ 1,524.4	$ 1,594.0
Weighted average life (years)	[1]	14 years 9 months 18 days	14 years 9 months 18 days
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, excluding foreign currency translation		$ 40.3	$ 39.3
Accumulated amortization, excluding foreign currency translation		(35.4)	(34.0)
Net carrying value, excluding foreign currency translation		$ 4.9	$ 5.3
Weighted average life (years)	[1]	4 years 4 months 24 days	4 years 4 months 24 days

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