Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2020

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 2020 and 2019 were as follows:

	Pension Benefits
	2020						2019
Three Months Ended 31 March	U.S.			International			U.S.			International
Service cost		$5.8			$5.8			$5.3			$4.9
Interest cost	22.8			6.2			28.4			9.0
Expected return on plan assets	(47.2		)	(19.4		)	(43.1		)	(19.2		)
Prior service cost amortization	0.3			—			0.3			0.1
Actuarial loss amortization	21.0			4.9			16.5			2.8
Settlements	1.5			—			5.0			—
Special termination benefits	—			—			—			—
Other	—			0.2			—			0.1
Net Periodic (Benefit) Cost		$4.2			($2.3	)		$12.4			($2.3	)

	Pension Benefits
	2020						2019
Six Months Ended 31 March	U.S.			International			U.S.			International
Service cost		$11.6			$11.7			$10.7			$9.8
Interest cost	45.6			12.4			56.8			18.0
Expected return on plan assets	(94.4		)	(38.9		)	(86.2		)	(38.1		)
Prior service cost amortization	0.6			—			0.6			0.1
Actuarial loss amortization	42.0			9.8			32.6			5.6
Settlements	1.5			—			5.8			0.2
Special termination benefits	—			—			0.7			—
Other	—			0.4			—			0.4
Net Periodic (Benefit) Cost		$6.9			($4.6	)		$21.0			($4.0	)