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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Sep. 30, 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 months ended September 30, 2018 and 2017 were as follows:
 
Three months ended September 30,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2.3

 
$
2.4

 
$
0.6

 
$
0.7

Interest cost
 
13.2

 
13.0

 
2.5

 
2.4

Expected return on plan assets
 
(16.2
)
 
(16.5
)
 
(1.7
)
 
(1.7
)
Amortization of net loss
 
2.6

 
3.4

 
0.4

 
0.7

Amortization of prior service cost (benefit)
 
0.5

 
0.5

 
(1.3
)
 
(1.3
)
    Net periodic benefit costs
 
$
2.4

 
$
2.8

 
$
0.5

 
$
0.8