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Retirement Benefits (Tables) | 9 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Net Periodic (Benefit) Cost | The components of net periodic cost for our defined benefit pension plans for the three and nine months ended 30 June 2025 and 2024 were as follows:
| Pension Benefits |  |
| 2025 |  | 2024 |  |  |  |
Three Months Ended 30 June | U.S. | International | Total |  | U.S. | International | Total |  |  |  |
Service cost | $2.3 |  | $3.0 |  | $5.3 |  |  | $2.4 |  | $2.8 |  | $5.2 |  |  |  |  |
Non-service cost: |  |  |  |  |  |  |  |  |  |  |
Interest cost | 29.9 |  | 14.5 |  | 44.4 |  |  | 33.7 |  | 14.9 |  | 48.6 |  |  |  |  |
Expected return on plan assets | (33.1) |  | (15.3) |  | (48.4) |  |  | (30.0) |  | (11.7) |  | (41.7) |  |  |  |  |
Prior service cost amortization | 0.2 |  | 0.3 |  | 0.5 |  |  | 0.3 |  | 0.2 |  | 0.5 |  |  |  |  |
Actuarial loss amortization | 11.7 |  | 2.4 |  | 14.1 |  |  | 14.3 |  | 3.2 |  | 17.5 |  |  |  |  |
Settlements | — |  | 0.3 |  | 0.3 |  |  | — |  | 0.4 |  | 0.4 |  |  |  |  |
Other | — |  | 0.1 |  | 0.1 |  |  | — |  | 0.6 |  | 0.6 |  |  |  |  |
Net Periodic Cost | $11.0 |  | $5.3 |  | $16.3 |  |  | $20.7 |  | $10.4 |  | $31.1 |  |  |  |  |
| Pension Benefits |  |
| 2025 |  | 2024 |  |  |  |
Nine Months Ended 30 June | U.S. | International | Total |  | U.S. | International | Total |  |  |  |
Service cost | $6.9 |  | $8.6 |  | $15.5 |  |  | $7.2 |  | $8.4 |  | $15.6 |  |  |  |  |
Non-service cost: |  |  |  |  |  |  |  |  |  |  |
Interest cost | 89.7 |  | 42.2 |  | 131.9 |  |  | 101.1 |  | 44.7 |  | 145.8 |  |  |  |  |
Expected return on plan assets | (99.5) |  | (44.5) |  | (144.0) |  |  | (90.0) |  | (35.2) |  | (125.2) |  |  |  |  |
Prior service cost amortization | 0.8 |  | 0.7 |  | 1.5 |  |  | 0.9 |  | 0.7 |  | 1.6 |  |  |  |  |
Actuarial loss amortization | 35.1 |  | 7.2 |  | 42.3 |  |  | 42.9 |  | 9.6 |  | 52.5 |  |  |  |  |
Settlements | — |  | 0.4 |  | 0.4 |  |  | — |  | 0.6 |  | 0.6 |  |  |  |  |
Other | — |  | 0.2 |  | 0.2 |  |  | — |  | 0.8 |  | 0.8 |  |  |  |  |
Net Periodic Cost | $33.0 |  | $14.8 |  | $47.8 |  |  | $62.1 |  | $29.6 |  | $91.7 |  |  |  |  |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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