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Retirement Plans
 3 Months Ended
Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Plans
Retirement Plans
The components of net periodic benefit cost for our pension plans are presented below.
 
Three months ended
 
December 31,
 
2016
 
2015
 
(in millions)
Service cost
$
0.5

 
$
0.4

Interest cost
3.6

 
5.1

Expected return on plan assets
(4.3
)
 
(5.1
)
Amortization of actuarial net loss
1.0

 
0.8

Net periodic benefit cost
$
0.8

 
$
1.2


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