Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Liabilities related to postretirement benefit plan	$ 76.3	$ 77.7
Discounted rate for benefit plan	2.30%	1.80%
2022	$ 2.6
2023	2.9
2024	3.2
2025	3.6
2026	4.4
2027-2031	23.0
Supplemental Nonqualified Unfunded Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of insurance contracts	40.5	$ 43.5
Recognized investment gains on the cash surrender value of the Retirement Plan life insurance contracts	1.1	(0.7)	$ (2.1)
Benefits paid	1.9	1.9	1.8
Unfunded Death Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of insurance contracts	18.5	18.8
Recognized investment gains on the cash surrender value of the Retirement Plan life insurance contracts	$ 0.3	(0.3)	$ (0.9)
Benefits paid		$ 1.7

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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