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Retirement Plans (Tables) | 9 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Schedule of Net Periodic Benefit Cost | The components of net periodic costs (benefits) for our pension plans are presented below:
| Three months ended |  | Nine months ended
| June 30, |  | June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
| (in millions)
Service cost | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.6 |  |  | $ | 0.9 |
Pension costs (benefits) other than service: |  |  |  |  |  |  |
Interest cost | 3.4 |  |  | 2.5 |  |  | 10.4 |  |  | 7.3 |
Expected return on plan assets | (3.5) |  |  | (3.8) |  |  | (10.4) |  |  | (11.4) |
Amortization of actuarial net loss | 1.0 |  |  | 0.4 |  |  | 2.8 |  |  | 1.2 |
Pension costs (benefits) other than service | 0.9 |  |  | (0.9) |  |  | 2.8 |  |  | (2.9) |
Net periodic costs (benefits) | $ | 1.1 |  |  | $ | (0.6) |  |  | $ | 3.4 |  |  | $ | (2.0) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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