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Pension and Other Postretirement Benefits (Tables) | 9 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Schedule of Components of the Net Periodic Pension (Income) Expense | The components of the net periodic pension expense (income) related to the Company's pension and other postretirement benefits for the three and nine months ended March 31, 2024 and 2023 were as follows:
|  | Three Months Ended March 31,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
($ in millions) |  | Pension Plans |  | Other Postretirement Plans
Service cost |  | $ | 2.1 |  |  | $ | 2.0 |  |  | $ | 0.3 |  |  | $ | 0.5 |
Interest cost |  | 10.4 |  |  | 11.5 |  |  | 2.6 |  |  | 2.4 |
Expected return on plan assets |  | (8.3) |  |  | (11.2) |  |  | (1.8) |  |  | (1.7) |
Amortization of net loss (gain) |  | 1.9 |  |  | 2.4 |  |  | (0.6) |  |  | (0.4) |
Amortization of prior service cost (credits) |  | 0.5 |  |  | 0.5 |  |  | (1.0) |  |  | (1.0) |
Pension settlement charge |  | 51.9 |  |  | — |  |  | — |  |  | — |
Net pension expense (income) |  | $ | 58.5 |  |  | $ | 5.2 |  |  | $ | (0.5) |  |  | $ | (0.2) |
|  | Nine Months Ended March 31,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
($ in millions) |  | Pension Plans |  | Other Postretirement Plans
Service cost |  | $ | 6.2 |  |  | $ | 5.9 |  |  | $ | 1.1 |  |  | $ | 1.5 |
Interest cost |  | 34.0 |  |  | 34.5 |  |  | 7.6 |  |  | 7.2 |
Expected return on plan assets |  | (28.5) |  |  | (33.6) |  |  | (5.5) |  |  | (5.1) |
Amortization of net loss (gain) |  | 6.2 |  |  | 7.2 |  |  | (1.9) |  |  | (1.2) |
Amortization of prior service cost (credits) |  | 1.6 |  |  | 1.5 |  |  | (2.9) |  |  | (3.0) |
Pension settlement charge |  | 51.9 |  |  | — |  |  | — |  |  | — |
Net pension expense (income) |  | $ | 71.4 |  |  | $ | 15.5 |  |  | $ | (1.6) |  |  | $ | (0.6) |

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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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