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Retirement Plans
 3 Months Ended
Dec. 31, 2018
Defined Benefit Plan [Abstract]  
Retirement Plans Retirement Plans
The components of net periodic benefit cost for our pension plans are presented below.
 
Three months ended
 
December 31,
 
2018
 
2017
 
(in millions)
Service cost
$
0.4

 
$
0.5

Pension costs (benefits) other than service:
 
 
 
Interest cost
3.5

 
3.6

Expected return on plan assets
(4.1
)
 
(4.2
)
Amortization of actuarial net loss
0.5

 
0.8

Pension costs (benefits) other than service
(0.1
)
 
0.2

Net periodic benefit cost
$
0.3

 
$
0.7


The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive loss.