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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 as follows.
 
Three months ended
 
December 31,
 
2015
 
2014
 
(in millions)
Service cost
$
0.4

 
$
0.5

Interest cost
5.1

 
5.0

Expected return on plan assets
(5.1
)
 
(6.2
)
Amortization of actuarial net loss
0.8

 
0.8

Net periodic benefit cost
$
1.2

 
$
0.1


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