Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues from services	[1]	$ 18,914.5	$ 19,827.5	$ 20,724.4
Franchise fees
Segment Reporting Information [Line Items]
Revenues from services		14.8	15.7	15.3
Americas | United States
Segment Reporting Information [Line Items]
Revenues from services		2,961.6	3,499.3
Americas | United States | Franchise fees
Segment Reporting Information [Line Items]
Revenues from services		$ 11.9	$ 12.8	$ 12.8

[1] (a) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $11.9, $12.8 and $12.8 for 2023, 2022, and 2021, respectively.