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Pension and Other Postretirement Benefits
 9 Months Ended
Mar. 31, 2020
Retirement Benefits [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 nine months ended March 31, 2020 and 2019 were as follows:
 
Three months ended March 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2020
 
2019
 
2020
 
2019
Service cost
 
$
2.4

 
$
2.3

 
$
0.7

 
$
0.6

Interest cost
 
11.7

 
13.2

 
2.3

 
2.5

Expected return on plan assets
 
(15.5
)
 
(16.2
)
 
(1.8
)
 
(1.7
)
Amortization of net loss
 
3.9

 
2.6

 
0.6

 
0.4

Amortization of prior service cost (benefit)
 
0.5

 
0.5

 
(1.0
)
 
(1.3
)
    Net pension expense
 
$
3.0

 
$
2.4

 
$
0.8

 
$
0.5


Nine months ended March 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2020
 
2019
 
2020
 
2019
Service cost
 
$
7.3

 
$
6.9

 
$
2.0

 
$
1.8

Interest cost
 
35.1

 
39.6

 
6.8

 
7.6

Expected return on plan assets
 
(46.6
)
 
(48.6
)
 
(5.3
)
 
(5.2
)
Amortization of net loss
 
11.6

 
7.8

 
1.9

 
1.2

Amortization of prior service cost (benefit)
 
1.6

 
1.5

 
(2.9
)
 
(3.9
)
    Net pension expense
 
$
9.0

 
$
7.2

 
$
2.5

 
$
1.5



During the nine months ended March 31, 2020 and 2019, the Company made $4.9 million and $4.3 million, respectively, of contributions to its qualified defined benefit pension plans. The Company currently expects to contribute $1.3 million to its qualified defined benefit pension plans during the remainder of fiscal year 2020.