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Retirement Plans
 6 Months Ended
Mar. 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
 
Six months ended
 
March 31,
 
March 31,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
0.4

 
$
0.5

 
$
0.9

 
$
1.0

Pension costs other than service:
 
 
 
 
 
 
 
Interest cost
3.6

 
3.6

 
7.2

 
7.2

Expected return on plan assets
(4.1
)
 
(4.2
)
 
(8.3
)
 
(8.5
)
Amortization of actuarial net loss
0.8

 
1.0

 
1.6

 
2.0

 
0.3

 
0.4

 
0.5

 
0.7

Net periodic benefit cost
$
0.7

 
$
0.9

 
$
1.4

 
$
1.7


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