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Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Liabilities related to postretirement benefit plan | $ 61.4 | $ 76.3 |
Discounted rate for benefit plan | 4.80% | 2.30% |
2023 | $ 3.0 |  |
2024 | 3.1 |  |
2025 | 3.5 |  |
2026 | 4.6 |  |
2027 | 4.6 |  |
2028-2032 | $ 24.4 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Amortization of prior service cost | Amortization of prior service cost | Amortization of prior service cost
Supplemental Nonqualified Unfunded Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of insurance contracts | $ 35.3 | $ 40.5 |
Recognized investment gains (losses) on the cash surrender value of the Retirement Plan life insurance contracts | 3.1 | 1.1 | $ (0.7)
Benefits paid | 2.0 | 1.9 | 1.9
Unfunded Death Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of insurance contracts | 16.8 | 18.5 |
Recognized investment gains (losses) on the cash surrender value of the Retirement Plan life insurance contracts | 1.5 | $ 0.3 | $ (0.3)
Benefits paid | $ 0.7 |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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