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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2017 and 2016 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2017
 
Mar 31,
2016
Service Cost Earned
 
$
—

 
$
2.2

Interest Cost on Projected Benefit Obligation
 
5.1

 
5.4

Expected Return on Plan Assets
 
(7.7
)
 
(8.2
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
0.6

 
3.0

Total Pension Expense (Benefit) Recognized
 
$
(2.0
)
 
$
2.4
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 three months ended March 31, 2017 and 2016 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2017
 
Mar 31,
2016
Service Cost Earned
 
$
—

 
$
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.1

 
0.2

Amortization of Prior Service Credit
 
(0.3
)
 
—

Amortization of Accumulated Net Unrecognized Gain
 
(0.4
)
 
(0.3
)
Total OPEB Benefit
 
$
(0.6
)
 
$
(0.1
)