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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 3 Months Ended
Mar. 31, 2019
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] The components of Pension Income for the Pension Plan for the three months ended March 31, 2019 and 2018 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2019
 
Mar 31,
2018
Service Cost
 
$
—

 
$
—

Interest Cost on Projected Benefit Obligation
 
5.5

 
5.1

Expected Return on Plan Assets
 
(7.6
)
 
(7.2
)
Amortization of Net Actuarial Loss
 
0.7

 
1.0

Total Pension Benefit Recognized
 
(1.4
)
 
(1.1
)
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 benefits for the OPEB Plans for the three months ended March 31, 2019 and 2018 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2019
 
Mar 31,
2018
Service Cost
 
$
0.1

 
$
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.1

 
0.1

Amortization of Prior Service Credit
 
(0.3
)
 
(0.3
)
Amortization of Net Gain
 
(0.5
)
 
(0.4
)
Total OPEB Benefit Recognized
 
$
(0.6
)
 
$
(0.6
)
The non-service cost component of the Pension Plan and OPEB Plans are presented within the Interest and Other Expenses line item in the Condensed Consolidated Statement of Income.