Retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2026

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 2026 and 2025 were as follows:

	Pension Benefits
	2026			2025
Three Months Ended 30 June	U.S.	International	Total	U.S.	International	Total
Service cost	$1.9	$2.8	$4.7	$2.3	$3.0	$5.3
Non-service cost:
Interest cost	29.0	15.3	44.3	29.9	14.5	44.4
Expected return on plan assets	(35.1)	(17.3)	(52.4)	(33.1)	(15.3)	(48.4)
Prior service cost amortization	0.2	0.2	0.4	0.2	0.3	0.5
Actuarial loss amortization	8.7	2.2	10.9	11.7	2.4	14.1
Settlements	—	—	—	—	0.3	0.3
Other	—	0.3	0.3	—	0.1	0.1
Net Periodic Cost	$4.7	$3.5	$8.2	$11.0	$5.3	$16.3

	Pension Benefits
	2026			2025
Nine Months Ended 30 June	U.S.	International	Total	U.S.	International	Total
Service cost	$5.7	$8.4	$14.1	$6.9	$8.6	$15.5
Non-service cost:
Interest cost	87.1	44.9	132.0	89.7	42.2	131.9
Expected return on plan assets	(105.6)	(51.5)	(157.1)	(99.5)	(44.5)	(144.0)
Prior service cost amortization	0.8	0.7	1.5	0.8	0.7	1.5
Actuarial loss amortization	26.1	7.4	33.5	35.1	7.2	42.3
Settlements	1.2	0.1	1.3	—	0.4	0.4
Other	—	0.9	0.9	—	0.2	0.2
Net Periodic Cost	$15.3	$10.9	$26.2	$33.0	$14.8	$47.8