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Employee and Agent Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Pension benefits |  |
Components of Net Periodic Benefit Cost (Income) |  |
Service cost | $ 14.0 | $ 20.2
Interest cost | $ 39.7 | $ 28.1
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Expected return on plan assets | $ (40.7) | $ (44.7)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (4.2) | $ (4.2)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ 9.8 | $ 13.8
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses
Net periodic benefit cost (income) | $ 18.6 | $ 13.2
Contributions made by employer to fund qualified and nonqualified pension plans | 30.0 |
Pension benefits | Maximum |  |
Components of Net Periodic Benefit Cost (Income) |  |
Amount of possible contributions to be made during the current fiscal year to the qualified and nonqualified pension plans combined | 70.0 |
Other postretirement benefits |  |
Components of Net Periodic Benefit Cost (Income) |  |
Interest cost | $ 0.8 | $ 0.6
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Expected return on plan assets | $ (1.1) | $ (1.2)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (0.3) | $ (0.3)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ (0.2) | $ (0.3)
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses
Net periodic benefit cost (income) | $ (0.8) | $ (1.2)

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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