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Pension Benefits and Postretirement Benefits Other Than Pensions
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension Benefits and Postretirement Benefits Other Than Pensions
Note 9 - Pension Benefits and Postretirement Benefits Other Than Pensions
The Company sponsors a qualified defined benefit pension plan (the “Pension Plan”) that covers approximately 9,000 participants and beneficiaries, of which 1,600 are active employees. The Pension Plan is closed to employees newly-hired after January 1, 2006. On May 12, 2016, the Company amended the Pension Plan to freeze benefit accruals, effective June 30, 2016, for substantially all of the participants under the plan. The components of Pension Expense (Benefit) for the Pension Plan for the nine and three months ended September 30, 2017 and 2016 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2017
 
Sep 30,
2016
 
Sep 30,
2017
 
Sep 30,
2016
Service Cost Earned
 
$
—

 
$
4.8

 
$
—

 
$
—

Interest Cost on Projected Benefit Obligation
 
15.4

 
15.2

 
5.1

 
4.8

Expected Return on Plan Assets
 
(23.2
)
 
(24.5
)
 
(7.7
)
 
(8.3
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
2.0

 
5.8

 
0.7

 
0.9

Curtailment Gain
 
—

 
(0.3
)
 
—

 
—

Total Pension Expense (Benefit) Recognized
 
$
(5.8
)
 
$
1.0

 
$
(1.9
)
 
$
(2.6
)

The Company also sponsors an other postretirement benefit (“OPEB”) plan that provides medical, dental and/or life insurance benefits to approximately 475 retired and 200 active employees (the “OPEB Plan”). The components of OPEB Benefit for the OPEB Plan for the nine and three months ended September 30, 2017 and 2016 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2017
 
Sep 30,
2016
 
Sep 30,
2017
 
Sep 30,
2016
Service Cost Earned
 
$
0.1

 
$
0.1

 
—

 
0.1

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.3

 
0.6

 
0.1

 
0.2

Amortization of Prior Service Credit
 
(1.0
)
 
—

 
(0.3
)
 
—

Amortization of Accumulated Net Unrecognized Gain
 
(1.4
)
 
(1.1
)
 
(0.5
)
 
(0.4
)
Total OPEB Benefit
 
$
(2.0
)
 
$
(0.4
)
 
$
(0.7
)
 
$
(0.1
)