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

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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