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Employee Benefit Plans
 9 Months Ended
Jun. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans

Components of net periodic pension benefit cost were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Nine Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
2.9

 
$
2.9

 
$
8.6

 
$
8.9

Interest cost
4.5

 
4.5

 
13.6

 
13.5

Expected return on plan assets
(4.5
)
 
(4.5
)
 
(13.5
)
 
(13.6
)
Amortization of prior service cost
0.4

 
0.4

 
1.3

 
1.2

Amortization of net actuarial loss
0.6

 
0.7

 
1.8

 
2.0

 
$
3.9

 
$
4.0

 
$
11.8

 
$
12.0



Components of net periodic other post-employment benefit cost (income) were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Nine Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Components of net periodic benefit cost (income)
 
 
 
 
 
 
 
Service cost
$
0.4

 
$
0.4

 
$
1.1

 
$
1.3

Interest cost
0.3

 
0.4

 
1.1

 
1.2

Amortization of prior service cost
(0.2
)
 
(0.2
)
 
(0.7
)
 
(0.7
)
Curtailment
—

 
—

 
—

 
(3.4
)
Amortization of net actuarial loss (gain)
—

 
—

 
(0.1
)
 
0.1

 
$
0.5

 
$
0.6

 
$
1.4

 
$
(1.5
)


The Company made contributions to fund benefit payments under its other post-employment benefit plans of $1.6 million for both of the nine months ended June 30, 2016 and 2015. The Company estimates that it will make additional contributions of approximately $0.5 million under these other post-employment benefit plans prior to the end of fiscal 2016.

The Company's pension plan investment strategy is based on an expectation that, over time, equity securities will provide higher returns than debt securities. The plans primarily minimize the risk of larger losses under this strategy through diversification of investments by asset class, by investing in different styles of investment management within the classes and by using a number of different investment managers. Beginning in fiscal 2016, the Company began to implement a liability driven investment strategy for those pension plans with frozen benefits. The objective of this strategy is to more closely align the pension plan assets with the pension plan liabilities in terms of how both respond to changes in interest rates. Plan assets are allocated to two investment categories, including a category containing high quality fixed income securities and another category comprised of traditional securities and alternative asset classes. Assets are managed externally according to guidelines approved by the Company. Over time, the Company intends to reduce assets allocated to the return seeking category and correspondingly increase assets allocated to the high quality fixed income category to align more closely with the pension plan obligations.