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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 6 Months Ended
Jun. 30, 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 six and three months ended June 30, 2018 and 2017 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2018
 
Jun 30,
2017
 
Jun 30,
2018
 
Jun 30,
2017
Service Cost
 
$
—

 
$
—

 
$
—

 
$
—

Interest Cost on Projected Benefit Obligation
 
10.2

 
10.3

 
5.1

 
5.2

Expected Return on Plan Assets
 
(14.4
)
 
(15.5
)
 
(7.2
)
 
(7.8
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
2.1

 
1.3

 
1.1

 
0.7

Total Pension Benefit Recognized
 
$
(2.1
)
 
$
(3.9
)
 
$
(1.0
)
 
$
(1.9
)
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, 2018 and 2017 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2018
 
Jun 30,
2017
 
Jun 30,
2018
 
Jun 30,
2017
Service Cost
 
$
0.1

 
$
0.1

 
0.1

 
0.1

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.2

 
0.2

 
0.1

 
0.1

Amortization of Prior Service Credit
 
(0.9
)
 
(0.7
)
 
(0.6
)
 
(0.4
)
Amortization of Accumulated Net Unrecognized Gain
 
(0.7
)
 
(0.9
)
 
(0.3
)
 
(0.5
)
Total OPEB Benefit Recognized
 
$
(1.3
)
 
$
(1.3
)
 
$
(0.7
)
 
$
(0.7
)
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 Income.