v3.21.2

Retirement and Postretirement Benefit Plans (Schedule of Postretirement Health Care Plan) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Change in benefit obligation:
Benefit obligation at beginning of year	$ 371,800,000
Benefit obligation at end of year	363,800,000	$ 371,800,000
Amounts recorded in the Consolidated Balance Sheets:
Accrued benefits obligation, long-term	73.8	89,300,000
Postretirement Health Coverage [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	12,200,000	12,700,000
Service cost	100,000	100,000
Interest cost	100,000	200,000
Actuarial loss (gain)	1,800,000	(400,000)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1,800,000	1,000,000.0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	400,000	200,000
Benefit obligation at end of year	12,900,000	12,200,000
Amounts recorded in the Consolidated Balance Sheets:
Accrued benefits obligation, current portion	2,000,000.0	1,600,000
Accrued benefits obligation, long-term	10,900,000	10,600,000
Net amount recognized	12,900,000	12,200,000
Special Termination Benefits
Change in benefit obligation:
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	$ 100,000	$ 400,000

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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

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

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