Retirement Plans (Tables)

9 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Cost

The components of net periodic benefit cost for our pension plans are presented below.

	Three months ended				Nine months ended
	June 30,				June 30,
	2020		2019		2020		2019
	(in millions)
Service cost	$	0.4	$	0.4	$	1.2	$	1.2
Pension costs (benefits) other than service:
Interest cost	2.8		3.5		8.4		10.5
Expected return on plan assets	(4.2)		(4.1)		(12.6)		(12.2)
Amortization of actuarial net loss	0.7		0.5		2.0		1.5
Curtailment/special settlement loss	—		—		—		1.0
Pension costs (benefits) other than service	(0.7)		(0.1)		(2.2)		0.8
Net periodic (benefit) cost	$	(0.3)	$	0.3	$	(1.0)	$	2.0