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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 6 Months Ended
Jun. 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 six and three months ended June 30, 2017 and 2016 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2017
 
Jun 30,
2016
 
Jun 30,
2017
 
Jun 30,
2016
Service Cost Earned
 
$
—

 
$
4.8

 
$
—

 
$
2.6

Interest Cost on Projected Benefit Obligation
 
10.3

 
10.4

 
5.2

 
5.0

Expected Return on Plan Assets
 
(15.5
)
 
(16.2
)
 
(7.8
)
 
(8.0
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
1.3

 
4.9

 
0.7

 
1.9

Curtailment Gain
 
—

 
(0.3
)
 
—

 
(0.3
)
Total Pension Expense (Benefit) Recognized
 
$
(3.9
)
 
$
3.6

 
$
(1.9
)
 
$
1.2
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 six and three months ended June 30, 2017 and 2016 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2017
 
Jun 30,
2016
 
Jun 30,
2017
 
Jun 30,
2016
Service Cost Earned
 
$
0.1

 
$
—

 
0.1

 
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.2

 
0.4

 
0.1

 
0.2

Amortization of Prior Service Credit
 
(0.7
)
 
—

 
(0.4
)
 
—

Amortization of Accumulated Net Unrecognized Gain
 
(0.9
)
 
(0.7
)
 
(0.5
)
 
(0.4
)
Total OPEB Benefit
 
$
(1.3
)
 
$
(0.3
)
 
$
(0.7
)
 
$
(0.2
)