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Retirement Plans
 6 Months Ended
Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Plans
Retirement Plans
The components of net periodic benefit cost are as follows.
 
Three months ended
 
Six months ended
 
March 31,
 
March 31,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Service cost
$
0.5

 
$
0.4

 
$
1.0

 
$
0.8

Interest cost
5.0

 
5.0

 
10.0

 
10.0

Expected return on plan assets
(6.1
)
 
(6.0
)
 
(12.3
)
 
(11.9
)
Amortization of actuarial net loss
0.8

 
0.9

 
1.6

 
1.8

Net periodic benefit cost
$
0.2

 
$
0.3

 
$
0.3

 
$
0.7


The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive income (loss).
We contributed $1 million to our Canadian pension plans during the six months ended March 31, 2015. For financial reporting purposes, our pension plan obligations were 89% funded at September 30, 2014.