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Pension and Other Retiree Benefits (Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation [1] $ 0.0 $ 150.5
Fair value of plan assets 0.0 145.4
International    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation [1] 125.9 116.8
Fair value of plan assets $ 3.2 $ 4.0
[1] The decrease in 2025 under the U.S. as compared to 2024 is the result of the ACCO U.S. plan ABO no longer being in excess of plan assets as of December 31, 2025, unlike the prior year.