Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Cost

The components of net periodic (benefit) cost for our defined benefit pension plans for the three and six months ended 31 March 2022 and 2021 were as follows:

	Pension Benefits
	2022		2021
Three Months Ended 31 March	U.S.	International	U.S.	International
Service cost	$4.6	$5.6	$5.3	$5.9
Interest cost	18.4	7.6	17.3	6.3
Expected return on plan assets	(42.1)	(17.6)	(48.7)	(21.0)
Prior service cost amortization	0.3	—	0.3	—
Actuarial loss amortization	16.6	3.8	19.6	4.8
Settlements	0.9	0.2	—	—
Other	—	0.2	—	0.2
Net Periodic (Benefit) Cost	($1.3)	($0.2)	($6.2)	($3.8)

	Pension Benefits
	2022		2021
Six Months Ended 31 March	U.S.	International	U.S.	International
Service cost	$9.2	$11.2	$10.7	$11.6
Interest cost	36.8	15.2	34.5	12.4
Expected return on plan assets	(84.2)	(35.3)	(97.3)	(41.2)
Prior service cost amortization	0.6	—	0.6	—
Actuarial loss amortization	33.3	7.7	39.3	9.4
Settlements	1.8	0.2	—	—
Other	—	1.0	—	0.5
Net Periodic (Benefit) Cost	($2.5)	$—	($12.2)	($7.3)