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Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues from services	$ 4,924.4	$ 4,619.1
Franchise revenue	249.1	82.3
Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.6	3.3
Americas
Segment Reporting Information [Line Items]
Revenues from services	1,002.9	1,011.0
Americas | United States
Segment Reporting Information [Line Items]
Revenues from services	608.8	610.9
Americas | United States | Franchise fees
Segment Reporting Information [Line Items]
Revenues from services	3.1	3.0
Franchise revenue	$ 117.5	$ 76.5

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