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Pension and Other Postretirement Benefits
 6 Months Ended
Dec. 31, 2019
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 six months ended December 31, 2019 and 2018 were as follows:
 
Three months ended December 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2019
 
2018
 
2019
 
2018
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 periodic benefit costs
 
$
3.0

 
$
2.4

 
$
0.8

 
$
0.5


Six months ended December 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
4.9

 
$
4.6

 
$
1.4

 
$
1.2

Interest cost
 
23.4

 
26.4

 
4.6

 
5.1

Expected return on plan assets
 
(31.1
)
 
(32.4
)
 
(3.6
)
 
(3.5
)
Amortization of net loss
 
7.8

 
5.2

 
1.2

 
0.8

Amortization of prior service cost (benefit)
 
1.0

 
1.0

 
(2.0
)
 
(2.6
)
    Net periodic benefit costs
 
$
6.0

 
$
4.8

 
$
1.6

 
$
1.0



During the six months ended December 31, 2019 and 2018, the Company made $3.6 million and $3.3 million, respectively, of contributions to its qualified defined benefit pension plans. The Company currently expects to contribute $2.6 million to its qualified defined benefit pension plans during the remainder of fiscal year 2020.