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Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues from services	$ 5,140.6	$ 4,584.8	$ 15,342.1	$ 12,946.1
Franchise revenue	253.3	236.9	755.9	447.3
Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.9	3.8	11.0	9.9
Americas
Segment Reporting Information [Line Items]
Revenues from services	997.6	929.1	3,044.8	2,776.7
Americas | United States
Segment Reporting Information [Line Items]
Revenues from services	644.9	578.8	1,882.5	1,705.6
Americas | United States | Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.3	3.4	9.4	8.8
Franchise revenue	$ 121.3	$ 116.9	$ 353.4	$ 315.7

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