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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 9 Months Ended
Sep. 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 (Benefit) for the Pension Plan for the nine and three months ended September 30, 2016 and 2015 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2016
 
Sep 30,
2015
 
Sep 30,
2016
 
Sep 30,
2015
Service Cost Earned
 
$
4.8

 
$
7.9

 
$
—

 
$
2.7

Interest Cost on Projected Benefit Obligation
 
15.2

 
19.3

 
4.8

 
6.5

Expected Return on Plan Assets
 
(24.5
)
 
(26.3
)
 
(8.3
)
 
(8.8
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
5.8

 
18.3

 
0.9

 
6.1

Curtailment Gain
 
(0.3
)
 
—

 
—

 
—

Total Pension Expense (Benefit) Recognized
 
$
1.0

 
$
19.2

 
$
(2.6
)
 
$
6.5
Postretirement Benefits Other than Pensions [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of OPEB Benefit for the OPEB Plan for the nine and three months ended September 30, 2016 and 2015 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2016
 
Sep 30,
2015
 
Sep 30,
2016
 
Sep 30,
2015
Service Cost Earned
 
$
0.1

 
$
0.1

 
$
0.1

 
$
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.6

 
0.8

 
0.2

 
0.3

Amortization of Accumulated Net Unrecognized Gain
 
(1.1
)
 
(1.1
)
 
(0.4
)
 
(0.4
)
Total OPEB Benefit
 
$
(0.4
)
 
$
(0.2
)
 
$
(0.1
)
 
$
(0.1
)