Employee and Agent Benefits - Contributions (Details) - Pension benefits $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026 USD ($)	Sep. 30, 2026 USD ($)
Defined Benefit Plan Disclosures
Contributions made by employer to fund qualified and nonqualified pension plans	$ 25.5	$ 58.5
Maximum
Defined Benefit Plan Disclosures
Amount of possible contributions to be made during the current fiscal year to the qualified and nonqualified pension plans combined	$ 70.0	$ 70.0

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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