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v3.25.2

Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) - Pension Plan - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 5.3 | $ 5.2 | $ 15.5 | $ 15.6
Interest cost | 44.4 | 48.6 | 131.9 | 145.8
Expected return on plan assets | (48.4) | (41.7) | (144.0) | (125.2)
Prior service cost amortization | 0.5 | 0.5 | 1.5 | 1.6
Actuarial loss amortization | 14.1 | 17.5 | 42.3 | 52.5
Settlements | 0.3 | 0.4 | 0.4 | 0.6
Other | 0.1 | 0.6 | 0.2 | 0.8
Net Periodic Cost | 16.3 | 31.1 | 47.8 | 91.7
U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2.3 | 2.4 | 6.9 | 7.2
Interest cost | 29.9 | 33.7 | 89.7 | 101.1
Expected return on plan assets | (33.1) | (30.0) | (99.5) | (90.0)
Prior service cost amortization | 0.2 | 0.3 | 0.8 | 0.9
Actuarial loss amortization | 11.7 | 14.3 | 35.1 | 42.9
Settlements | 0.0 | 0.0 | 0.0 | 0.0
Other | 0.0 | 0.0 | 0.0 | 0.0
Net Periodic Cost | 11.0 | 20.7 | 33.0 | 62.1
International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 3.0 | 2.8 | 8.6 | 8.4
Interest cost | 14.5 | 14.9 | 42.2 | 44.7
Expected return on plan assets | (15.3) | (11.7) | (44.5) | (35.2)
Prior service cost amortization | 0.3 | 0.2 | 0.7 | 0.7
Actuarial loss amortization | 2.4 | 3.2 | 7.2 | 9.6
Settlements | 0.3 | 0.4 | 0.4 | 0.6
Other | 0.1 | 0.6 | 0.2 | 0.8
Net Periodic Cost | $ 5.3 | $ 10.4 | $ 14.8 | $ 29.6

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