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Employee and Agent Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Pension benefits |  |  |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |  |  |
Service cost | $ 20.8 | $ 18.2 | $ 62.4 | $ 54.5 |
Interest cost | $ 25.8 | $ 29.3 | $ 77.4 | $ 88.0 |
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Expected return on plan assets | $ (45.7) | $ (39.1) | $ (137.0) | $ (117.5) |
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Amortization of prior service (benefit) cost | $ (4.2) | $ (4.3) | $ (12.6) | $ (12.7) |
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Recognized net actuarial (gain) loss | $ 17.5 | $ 18.9 | $ 52.6 | $ 56.6 |
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Net periodic benefit cost (income) | $ 14.2 | $ 23.0 | $ 42.8 | $ 68.9 |
Contributions made by employer to fund qualified and nonqualified pension plans | 20.7 |  | 92.1 |  |
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 | 125.0 |  | 125.0 |  |
Other postretirement benefits |  |  |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |  |  |
Interest cost | $ 0.5 | $ 0.7 | $ 1.6 | $ 2.1 |
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Expected return on plan assets | $ (1.1) | $ (9.0) | $ (3.5) | $ (27.0) |
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Amortization of prior service (benefit) cost | $ (0.3) | $ (0.3) | $ (0.8) | $ (0.8) |
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Recognized net actuarial (gain) loss | $ (0.2) |  | $ (0.4) |  |
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Net periodic benefit cost (income) | $ (1.1) | $ (8.6) | $ (3.1) | $ (25.7) |
Contributions made by employer to fund qualified and nonqualified pension plans |  |  | $ 1.1 |  | $ 1.5

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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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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