Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues from services	$ 5,277.1	$ 3,742.2	$ 10,201.5	$ 8,361.3
Franchise revenue	253.5	128.1	502.6	210.4
Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.5	2.8	7.1	6.1
Americas
Segment Reporting Information [Line Items]
Revenues from services	1,044.3	836.6	2,047.2	1,847.6
Americas | United States
Segment Reporting Information [Line Items]
Revenues from services	628.8	515.9	1,237.6	1,126.8
Americas | United States | Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.0	2.4	6.1	5.4
Franchise revenue	$ 114.6	$ 122.3	$ 232.1	$ 198.8