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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 9 Months Ended
Sep. 30, 2017
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, 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
)
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, 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
)