Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023		Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues from services	[1]	$ 4,530.2	$ 4,675.6	[2]	$ 13,454.2	$ 14,284.0	[3]
Franchise revenue		282.5	243.5		847.4	744.3
Franchise fees
Segment Reporting Information [Line Items]
Revenues from services		3.3	3.8		10.6	11.0
Americas | United States
Segment Reporting Information [Line Items]
Revenues from services		697.4	730.2	[4]	2,074.8	2,180.9	[5]
Americas | United States | Franchise fees
Segment Reporting Information [Line Items]
Revenues from services		2.5	3.1		8.1	8.9
Franchise revenue		$ 91.2	$ 98.6		$ 278.4	$ 298.7

[1] Our consolidated revenues from services include fees received from our franchise offices of $3.3 and $3.8 for the three months ended September 30, 2024 and 2023, respectively, and $10.6 and $11.0 for the nine months ended September 30, 2024 and 2023, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $282.5 and $243.5 for the three months ended September 30, 2024 and 2023, respectively, and $847.4 and $744.3 for the nine months ended September 30, 2024 and 2023, respectively.

[2] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.

[3] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.

[4] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.

[5] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.