Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues from services	$ 4,800.9	$ 5,140.6	$ 15,018.3	$ 15,342.1
Franchise revenue	264.0	253.3	804.8	755.9
Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	4.4	3.9	11.9	11.0
Americas
Segment Reporting Information [Line Items]
Revenues from services	1,239.8	997.6	3,753.7	3,044.8
Americas | United States
Segment Reporting Information [Line Items]
Revenues from services	886.6	644.9	2,679.9	1,882.5
Americas | United States | Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.7	3.3	9.7	9.4
Franchise revenue	$ 121.9	$ 121.3	$ 360.8	$ 353.4