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Employee and Agent Benefits - Defined Contribution and Deferred Compensation Plans (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Contribution Plan Disclosures
Number of common stock shares allocated participants in the employee stock ownership plan	1.5	1.7
Fair value of employee stock ownership plan	$ 119,700,000	$ 135,600,000
Qualified benefit plans
Defined Contribution Plan Disclosures
Contribution rate of employer to match participant's contributions (as a percent)	75.00%
Maximum percent of participant's compensation matched by employer (as a percent)	6.00%
Pension benefits | Qualified benefit plans
Defined Contribution Plan Disclosures
Maximum amount of compensation eligible participants could contribute to defined contribution plans	$ 23,000
Amount contributed by the employer to defined contribution plans	75,400,000	74,100,000	$ 70,300,000
Pension benefits | Nonqualified benefit plans
Defined Contribution Plan Disclosures
Amount contributed by the employer to defined contribution plans	$ 3,600,000	$ 3,100,000	$ 3,900,000
Grandfathered Choice Participant | Nonqualified benefit plans
Defined Contribution Plan Disclosures
Contribution rate of employer to match participant's contributions (as a percent)	50.00%
Maximum percent of participant's compensation matched by employer (as a percent)	3.00%
All other participants | Nonqualified benefit plans
Defined Contribution Plan Disclosures
Contribution rate of employer to match participant's contributions (as a percent)	75.00%
Maximum percent of participant's compensation matched by employer (as a percent)	6.00%

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- Definition

The amount of contributions made by the employer during the period to defined contribution plans.

+ References

No definition available.

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- Definition

Fair value of earned and unearned shares held by the employee stock ownership plan (ESOP).

+ References

No definition available.

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

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- Definition

The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480489/718-40-50-1

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