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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 3 Months Ended
Mar. 31, 2020
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures The components of Pension Income for the Pension Plan for the three months ended March 31, 2020 and 2019 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2020
 
Mar 31,
2019
Interest Cost on Projected Benefit Obligation
 
$
4.5

 
$
5.5

Expected Return on Plan Assets
 
(7.3
)
 
(7.6
)
Amortization of Net Actuarial Loss
 
1.5

 
0.7

Total Pension Benefit Recognized
 
$
(1.3
)
 
$
(1.4
)
Postretirement Benefits Other than Pensions  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The components of OPEB benefits for the OPEB Plans for the three months ended March 31, 2020 and 2019 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2020
 
Mar 31,
2019
Service Cost
 
$
0.1

 
$
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
)
 
(0.5
)
Total OPEB Benefit Recognized
 
$
(0.6
)
 
$
(0.6
)