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Retirement Plans
 3 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
(in millions)
Service cost
$
0.5

 
$
0.5

Pension costs other than service:
 
 
 
Interest cost
3.6

 
3.6

Expected return on plan assets
(4.2
)
 
(4.3
)
Amortization of actuarial net loss
0.8

 
1.0

 
0.2

 
0.3

Net periodic benefit cost
$
0.7

 
$
0.8


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