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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of components of the net periodic benefit cost
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, 2018 and 2017 were as follows:
 
Three months ended March 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2.4

 
$
2.2

 
$
0.7

 
$
0.9

Interest cost
 
13.0

 
12.4

 
2.4

 
2.3

Expected return on plan assets
 
(16.5
)
 
(16.6
)
 
(1.7
)
 
(1.7
)
Amortization of net loss
 
3.4

 
9.5

 
0.7

 
0.8

Amortization of prior service cost (benefit)
 
0.5

 
0.5

 
(1.3
)
 
(1.6
)
    Net periodic benefit costs
 
$
2.8

 
$
8.0

 
$
0.8

 
$
0.7

Nine months ended March 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
7.1

 
$
18.1

 
$
2.0

 
$
2.8

Interest cost
 
39.1

 
37.8

 
7.2

 
6.9

Expected return on plan assets
 
(49.5
)
 
(48.4
)
 
(5.2
)
 
(5.1
)
Amortization of net loss
 
10.2

 
28.3

 
2.2

 
2.4

Amortization of prior service cost (benefit)
 
1.5

 
1.3

 
(4.0
)
 
(4.9
)
Curtailment charge
 
—

 
0.5

 
—

 
—

    Net periodic benefit costs
 
$
8.4

 
$
37.6

 
$
2.2

 
$
2.1