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Pension and Other Postretirement Benefits
 3 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefits
Pension and Other Postretirement Benefits
 
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, 2016 and 2015 were as follows:
 
Three months ended September 30,
 
Pension Plans
 
Other Postretirement Plans
($ in millions)
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
8.2

 
$
7.7

 
$
0.9

 
$
0.8

Interest cost
 
13.1

 
14.5

 
2.3

 
2.5

Expected return on plan assets
 
(15.3
)
 
(16.4
)
 
(1.7
)
 
(1.7
)
Amortization of net loss
 
9.4

 
6.8

 
0.8

 
0.7

Amortization of prior service cost (benefit)
 
0.2

 
0.1

 
(1.6
)
 
(1.6
)
Curtailment charge
 
0.5

 
$
—

 
$
—

 
$
—

    Net periodic benefit costs
 
$
16.1

 
$
12.7

 
$
0.7

 
$
0.7


During the three months ended September 30, 2016 and 2015, the Company made no contributions to its qualified defined benefit pension plans.
On September 14, 2016, the Company announced changes to retirement plans it offers to certain employees. The Company will freeze benefits accrued to eligible participants of its largest qualified defined benefit pension plan and certain non-qualified benefit plans effective December 31, 2016.  The Company recognized the plan freeze in the three months ended September 30, 2016 as a curtailment, since it eliminates the accrual of defined benefits for future services for a significant number of participants. The impact of the curtailment includes a one-time accelerated recognition of outstanding unamortized prior service costs of $0.5 million. The curtailment event triggered a re-measurement for the affected benefit plans as of August 31, 2016 using a weighted average discount rate of 3.57 percent. The re-measurement resulted in a reduction of accrued pension liabilities during the quarter of $18.7 million.
In October 2016, the Company made a voluntary pension contribution of $100 million to the affected qualified pension benefit plan that was announced in connection with the plan freeze.