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Pension and Other Postretirement Benefits
 6 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefits
Pension and Other Postretirement Benefits
 
The components of the net periodic benefit cost related to the Company’s pension and other postretirement benefits for the three and six months ended December 31, 2015 and 2014 were as follows:
 
Three months ended December 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
7.8

 
$
8.0

 
$
0.8

 
$
1.1

Interest cost
 
14.4

 
13.5

 
2.5

 
3.0

Expected return on plan assets
 
(16.4
)
 
(17.2
)
 
(1.7
)
 
(1.7
)
Amortization of net loss
 
6.8

 
4.2

 
0.7

 
0.5

Amortization of prior service cost (benefit)
 
0.1

 
0.1

 
(1.6
)
 
—

    Net periodic benefit costs
 
$
12.7

 
$
8.6

 
$
0.7

 
$
2.9

Six months ended December 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
15.6

 
$
16.0

 
$
1.7

 
$
2.2

Interest cost
 
28.8

 
27.0

 
5.2

 
5.9

Expected return on plan assets
 
(32.9
)
 
(34.4
)
 
(3.5
)
 
(3.3
)
Amortization of net loss
 
13.7

 
8.4

 
1.4

 
1.0

Amortization of prior service cost (benefit)
 
0.2

 
0.2

 
(3.3
)
 
—

    Net periodic benefit costs
 
$
25.4

 
$
17.2

 
$
1.5

 
$
5.8



During the six months ended December 31, 2015 and 2014, the Company made $0 million and $3.9 million, respectively, of contributions to its qualified defined benefit pension plans. The Company currently expects to make no contributions to its qualified defined benefit pension plans during the remainder of fiscal year 2016.