Retirement and Postretirement Benefit Plans (Narrative) (Details) $ in Millions	12 Months Ended
Sep. 30, 2020 USD ($) plan	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution savings plans expense	$ 31.9	$ 29.0	$ 28.4
Accumulated Benefit Obligation
Accumulated benefit obligation	$ 352.1	362.9
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirement plans \| plan	1
Net actuarial gains (losses) included in Accumulated Other Comprehensive Income (Loss)	$ (64.9)	(70.6)
Prior service (credits) costs included in Accumulated Other Comprehensive Income (Loss)	0.4	0.4
Pension items in AOCI, aggregate tax effect	16.3	$ 17.2
Estimated net actuarial loss that will be amortized over the next fiscal year	6.3
Estimated prior service cost that will be amortized over the next fiscal year	$ 0.1
Discount rate for expense	3.20%	4.20%	3.90%
Discount rate for obligation	2.70%	3.20%	4.20%
Defined Benefit Plan, Information about Plan Assets [Abstract]
Equity securities of one entity, maximum percentage of portfolio	10.00%
Cash Flows
Employer contributions	$ 1.0	$ 9.0
Domestic Plan [Member]
Accumulated Benefit Obligation
Accumulated benefit obligation	$ 325.7	338.0
Cash Flows
Funded percentage (in excess of)	85.00%
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirement plans \| plan	2
Net actuarial gains (losses) included in Accumulated Other Comprehensive Income (Loss)	$ 10.9	11.9
Prior service (credits) costs included in Accumulated Other Comprehensive Income (Loss)	(0.4)	(0.6)
Pension items in AOCI, aggregate tax effect	2.9	$ 2.4
Estimated net actuarial loss that will be amortized over the next fiscal year	1.6
Estimated prior service cost that will be amortized over the next fiscal year	$ (0.2)
Discount rate for expense	2.60%	4.00%	3.30%
Discount rate for obligation	1.80%	3.00%	4.00%
Ultimate health care cost trend rate	4.50%
Effect of one-percentage-point increase/decrease on service and interest costs	$ 0.1
Effect of one-percentage-point increase on service and benefit obligation	0.6
Expected employer contributions required in next year	1.6
Defined benefit plan estimated future employer contributions in next fiscal, per year, thereafter	$ 1.0
Postretirement Health Coverage [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	6.40%
Postretirement Health Coverage [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	5.80%
Executives [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirement plans \| plan	1
Cash [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 2.1	$ 4.2
UNITED STATES \| Pension Plan [Member]
Cash Flows
Employer contributions		$ 8.0

Defined benefit plan estimated future employer contributions in next fiscal per year thereafter.

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Defined Benefit Plan, Maximum Percentage Of Portfolio Comprised Of Individual Entity.

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Defined Benefit Plan, Number Of Plans

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Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) attributable to parent.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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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 contribution received by defined benefit plan from employer which increases plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

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Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Percentage of plan assets to benefit obligation of defined benefit plan.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of cost for defined contribution plan.

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