Retirement and Postretirement Plans (Tables)

12 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Components of Net Pension Expense

The following table provides the components of net pension expense for our defined benefit retirement plans.

	Three Months Ended June 30				Nine Months Ended June 30				Condensed Consolidated Statements of Income Item
	2021		2020		2021		2020
Service cost	$	0.5	$	0.5	$	1.5	$	1.3	Cost of goods sold
Service cost	0.8		0.9		2.4		2.5		Selling and administrative expenses
Interest cost	1.8		1.9		5.5		6.8		Investment income (expense) and other, net
Expected return on plan assets	(2.9)		(3.4)		(8.8)		(10.8)		Investment income (expense) and other, net
Amortization of unrecognized prior service cost, net	—		—		—		0.1		Investment income (expense) and other, net
Amortization of net loss	1.6		1.9		4.7		5.0		Investment income (expense) and other, net
Net periodic benefit cost	$	1.8	$	1.8	$	5.3	$	4.9
Special termination benefits1	—		—		3.3		—		Special charges
Settlement (loss) gain2	—		(0.1)		—		8.4		Investment income (expense) and other, net
Net pension expense	$	1.8	$	1.7	$	8.6	$	13.3
1 In September 2020, we offered certain employees in the United States the option to participate in a voluntary early retirement plan. The employees who accepted the offer received special termination benefits during the nine months ended June 30, 2021, which were recorded as a component of Special charges in the Condensed Consolidated Statements of Income. See Note 8. Special Charges for further information.
2 On March 9, 2020, we transferred pension assets totaling $40.6 million to purchase annuity contracts for a certain population of retirees with a third-party insurance company. As a result, we recognized a non-cash settlement loss of $8.4 million for the for the nine months ended June 30, 2020, which is recorded as a component of Investment income (expense) and other, net in the Condensed Consolidated Statements of Income.