Retirement Plans (Tables)

3 Months Ended

Dec. 31, 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
	December 31,
	2020		2019
	(in millions)
Service cost	$	0.4	$	0.4
Pension costs (benefits) other than service:
Interest cost	2.5		2.8
Expected return on plan assets	(3.9)		(4.2)
Amortization of actuarial net loss	0.6		0.7
Pension benefits other than service	(0.8)		(0.7)
Net periodic benefit	$	(0.4)	$	(0.3)