Summary of Significant Accounting Policies - Schedule of Goodwill, Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions		Dec. 31, 2025		Dec. 31, 2024		Dec. 31, 2023
Goodwill [Line Items]
Goodwill		$ 1,544.6	[1],[2]	$ 1,563.4	[1],[2]	$ 1,586.8
Finite-lived:
Gross		858.5		838.6
Accumulated Amortization		579.1		530.4
Net		279.4		308.2
Indefinite-lived:
Gross		150.7		177.9
Total intangible assets
Gross		1,009.2		1,016.5
Accumulated Amortization		579.1		530.4
Net		430.1		486.1
Tradenames
Indefinite-lived:
Gross	[3]	52.0		52.0
Reacquired franchise rights
Indefinite-lived:
Gross	[4]	98.7		125.9
Customer relationships
Finite-lived:
Gross		833.2		814.2
Accumulated Amortization		556.1		509.1
Net		277.1		305.1
Other
Finite-lived:
Gross		25.3		24.4
Accumulated Amortization		23.0		21.3
Net		$ 2.3		$ 3.1

[1] Balances were net of accumulated impairment loss of $749.3 ($232.1 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of both January 1, 2024 and December 31, 2024; and $807.4 ($24.7 related to Southern Europe, $265.5 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of December 31, 2025.

[2] Balances were net of accumulated impairment loss of $807.4 and $749.3 as of December 31, 2025 and 2024, respectively.

[3] Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2025 and 2024.

[4] Balances were net of accumulated impairment loss of $30.6 and none as of December 31, 2025 and 2024, respectively.