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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [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, 2015 and 2014 were as follows:
 
Three months ended September 30,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
7.7

 
$
8.0

 
$
0.8

 
$
1.1

Interest cost
 
14.5

 
13.5

 
2.5

 
3.0

Expected return on plan assets
 
(16.4
)
 
(17.2
)
 
(1.7
)
 
(1.7
)
Amortization of net loss
 
6.8

 
4.2

 
0.7

 
0.5

Amortization of prior service cost (benefit)
 
0.1

 
0.1

 
(1.6
)
 
—

Net periodic benefit costs
 
$
12.7

 
$
8.6

 
$
0.7

 
$
2.9