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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Sep. 30, 2019
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, 2019 and 2018 were as follows:
 
 
 
Pension Plans
 
Other Postretirement Plans
 
 
Three Months Ended September 30,
 
Three Months Ended September 30,
($ 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