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Employee and Agent Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Pension benefits |  |  |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |  |  |
Service cost | $ 20.8 | $ 18.2 | $ 41.6 | $ 36.3 |
Interest cost | $ 25.8 | $ 29.4 | $ 51.6 | $ 58.7 |
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Expected return on plan assets | $ (45.6) | $ (39.2) | $ (91.3) | $ (78.4) |
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) | $ (4.2) | $ (8.4) | $ (8.4) |
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 | $ 35.1 | $ 37.7 |
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Net periodic benefit cost (income) | $ 14.3 | $ 23.1 | $ 28.6 | $ 45.9 |
Contributions made by employer to fund qualified and nonqualified pension plans | 35.7 |  | 71.4 |  |
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 | $ 0.6 | $ 0.7 | $ 1.1 | $ 1.4 |
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Expected return on plan assets | $ (1.3) | $ (9.0) | $ (2.4) | $ (18.0) |
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 | $ (0.2) | $ (0.3) | $ (0.5) | $ (0.5) |
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 | $ (0.1) |  | $ (0.2) |  |
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses | Operating expenses |
Net periodic benefit cost (income) | $ (1.0) | $ (8.6) | $ (2.0) | $ (17.1) |
Contributions made by employer to fund qualified and nonqualified pension plans |  |  | $ 0.8 |  | $ 1.5

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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=109237824&loc=SL108413299-114919 Reference 4: 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=118257860&loc=d3e4587-114921 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)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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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=118257860&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=118257860&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=118255775&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=109237824&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=118255775&loc=d3e2709-114920 + Details
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