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v3.23.3

Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Projected benefit obligations: |  |  |
Service cost | $ 0.8 | $ 1.3 | $ 1.5
Interest cost | 13.9 | 9.8 | 9.9
Plan assets: |  |  |
Beginning of year | 251.8 |  |
End of year | 239.8 | 251.8 |
Recognized on balance sheet: |  |  |
Pension asset | 6.6 | 0.6 |
Pension Plan, Defined Benefit [Member] |  |  |
Projected benefit obligations: |  |  |
Beginning of year | 251.2 | 336.8 |
Service cost | 0.8 | 1.3 |
Interest cost | 13.9 | 9.8 |
Actuarial loss (gain) | (10.4) | (74.0) |
Benefits paid | (22.3) | (22.7) |
End of year |  | 251.2 | 336.8
Accumulated benefit obligation at end of year | 233.2 | 251.2 |
Plan assets: |  |  |
Beginning of year | 251.8 | 353.5 |
Actual return on plan assets | 10.3 | (79.0) |
Benefits paid | (22.3) | (22.7) |
End of year | 239.8 | 251.8 | $ 353.5
Accrued benefit cost at end of year: |  |  |
Unfunded status | 6.6 | 0.6 |
Recognized on balance sheet: |  |  |
Pension asset | 6.6 | 0.6 |
Recognized in accumulated other comprehensive loss, before tax: |  |  |
Net actuarial loss (gain) | 68.2 | 78.7 |
Recognized in accumulated other comprehensive loss, before tax | $ 68.2 | $ 78.7 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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