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v3.22.2.2

Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Projected benefit obligations: |  |  |
Service cost | $ 1.3 | $ 1.5 | $ 1.5
Interest cost | 9.8 | 9.9 | 11.2
Plan assets: |  |  |
Beginning of year | 353.5 |  |
End of year | 251.8 | 353.5 |
Recognized on balance sheet: |  |  |
Pension asset | 0.6 | 16.8 |
Pension Plan, Defined Benefit [Member] |  |  |
Projected benefit obligations: |  |  |
Beginning of year | 336.8 | 359.5 |
Service cost | 1.3 | 1.5 |
Interest cost | 9.8 | 9.9 |
Actuarial loss (gain) | (74.0) | (10.8) |
Benefits paid | (22.7) | (23.3) |
End of year |  | 336.8 | 359.5
Accumulated benefit obligation at end of year | 251.2 | 336.8 |
Plan assets: |  |  |
Beginning of year | 353.5 | 360.4 |
Actual return on plan assets | (79.0) | 16.4 |
Benefits paid | (22.7) | (23.3) |
End of year | 251.8 | 353.5 | $ 360.4
Accrued benefit cost at end of year: |  |  |
Unfunded status | 0.6 | 16.8 |
Recognized on balance sheet: |  |  |
Pension asset | 0.6 | 16.8 |
Recognized in accumulated other comprehensive loss, before tax: |  |  |
Net actuarial loss (gain) | 78.7 | 59.9 |
Recognized in accumulated other comprehensive loss, before tax | $ 78.7 | $ 59.9 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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