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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 3 Months Ended
Mar. 31, 2018
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of Pension Benefit for the Pension Plan for the three months ended March 31, 2018 and 2017 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2018
 
Mar 31,
2017
Service Cost
 
$
—

 
$
—

Interest Cost on Projected Benefit Obligation
 
5.1

 
5.1

Expected Return on Plan Assets
 
(7.2
)
 
(7.7
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
1.0

 
0.6

Total Pension Benefit Recognized
 
$
(1.1
)
 
$
(2.0
)
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, 2018 and 2017 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2018
 
Mar 31,
2017
Service Cost
 
$
—

 
$
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.1

 
0.1

Amortization of Prior Service Credit
 
(0.3
)
 
(0.3
)
Amortization of Accumulated Net Unrecognized Gain
 
(0.4
)
 
(0.4
)
Total OPEB Benefit Recognized
 
$
(0.6
)
 
$
(0.6
)
The non-service cost component of the Pension Plan and OBEB Plan is presented within the Interest and Other Expenses line item in the Condensed Consolidated Statement of Operations.