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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 6 Months Ended
Jun. 30, 2016
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of Pension Expense for the Pension Plan for the six and three months ended June 30, 2016 and 2015 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2016
 
Jun 30,
2015
 
Jun 30,
2016
 
Jun 30,
2015
Service Cost Earned
 
$
4.8

 
$
5.2

 
$
2.6

 
$
2.6

Interest Cost on Projected Benefit Obligation
 
10.4

 
12.8

 
5.0

 
6.4

Expected Return on Plan Assets
 
(16.2
)
 
(17.5
)
 
(8.0
)
 
(8.7
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
4.9

 
12.2

 
1.9

 
6.4

Curtailment Gain
 
(0.3
)
 
—

 
(0.3
)
 
—

Total Pension Expense Recognized
 
$
3.6

 
$
12.7

 
$
1.2

 
$
6.7
Postretirement Benefits Other than Pensions [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of Postretirement Benefits Other than Pensions Expense (Benefit) for the OPEB Plan for the six and three months ended June 30, 2016 and 2015 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2016
 
Jun 30,
2015
 
Jun 30,
2016
 
Jun 30,
2015
Service Cost Earned
 
$
—

 
$
0.1

 
$
—

 
$
0.1

Interest Cost on Projected Benefit Obligation
 
0.4

 
0.5

 
0.2

 
0.2

Amortization of Accumulated Net Unrecognized Gain
 
(0.7
)
 
(0.7
)
 
(0.4
)
 
(0.3
)
Total Postretirement Benefits Other than Pensions Expense (Benefit)
 
$
(0.3
)
 
$
(0.1
)
 
$
(0.2
)
 
$
—