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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Dec. 31, 2017
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 six months ended December 31, 2017 and 2016 were as follows:
 
Three months ended December 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
2.4

 
$
7.7

 
$
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

 
$
13.5

 
$
0.8

 
$
0.7

Six months ended December 31,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
4.7

 
$
16.0

 
$
1.3

 
$
1.8

Interest cost
 
26.1

 
25.3

 
4.8

 
4.6

Expected return on plan assets
 
(33.0
)
 
(31.9
)
 
(3.5
)
 
(3.4
)
Amortization of net loss
 
6.8

 
18.9

 
1.5

 
1.6

Amortization of prior service cost (benefit)
 
1.0

 
0.8

 
(2.6
)
 
(3.2
)
Curtailment charge
 
—

 
0.5

 
—

 
—

    Net periodic benefit costs
 
$
5.6

 
$
29.6

 
$
1.5

 
$
1.4