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Employee and Agent Benefits - ABO in Excess of Plan Assets (Details) - Pension benefits - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Information for Defined Benefit Plans With an Accumulated Benefit Obligation in Excess of Plan Assets
Projected benefit obligation for defined benefit plans with an accumulated benefit obligation in excess of plan assets	$ 3,245.9	$ 3,390.9
Accumulated benefit obligation for defined benefit plans with an accumulated benefit obligation in excess of plan assets	3,245.9	3,390.9
Fair value of plan assets for defined benefit plans with an accumulated benefit obligation in excess of plan assets	$ 2,813.7	$ 2,909.6

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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