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Retirement Plans
 6 Months Ended
Mar. 31, 2016
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
 
Six months ended
 
March 31,
 
March 31,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Service cost
$
0.4

 
$
0.5

 
$
0.8

 
$
1.0

Interest cost
5.0

 
5.0

 
10.1

 
10.0

Expected return on plan assets
(5.1
)
 
(6.1
)
 
(10.2
)
 
(12.3
)
Amortization of actuarial net loss
0.8

 
0.8

 
1.6

 
1.6

Net periodic benefit cost
$
1.1

 
$
0.2

 
$
2.3

 
$
0.3


The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive income (loss).
During the second quarter, our U.S. pension plan initiated a pension obligation settlement program targeting terminated participants not yet receiving benefits. Pension plan assets will be used to currently settle expected future retirement benefits for those pension plan participants who elect to participate in the program. We expect to incur a one-time, non-cash charge of approximately $18 million before related income tax effects. We do not expect this settlement will have a material impact on the U.S. pension plan’s funded ratio.