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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 6 Months Ended
Jun. 30, 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 six and three months ended June 30, 2020 and 2019 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2020
 
Jun 30,
2019
 
Jun 30,
2020
 
Jun 30,
2019
Interest Cost on Projected Benefit Obligation
 
$
9.0

 
$
11.2

 
$
4.5

 
$
5.7

Expected Return on Plan Assets
 
(14.7
)
 
(15.3
)
 
(7.4
)
 
(7.7
)
Amortization of Net Actuarial Loss
 
3.0

 
1.5

 
1.5

 
0.8

Total Pension Benefit Recognized
 
$
(2.7
)
 
$
(2.6
)
 
$
(1.4
)
 
$
(1.2
)
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 six and three months ended June 30, 2020 and 2019 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2020
 
Jun 30,
2019
 
Jun 30,
2020
 
Jun 30,
2019
Service Cost
 
$
0.1

 
$
0.1

 
$
—

 
$
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.2

 
0.3

 
0.1

 
0.2

Amortization of Prior Service Credit
 
(0.7
)
 
(0.7
)
 
(0.4
)
 
(0.4
)
Amortization of Net Gain
 
(1.0
)
 
(1.0
)
 
(0.5
)
 
(0.5
)
Total OPEB Benefit Recognized
 
$
(1.4
)
 
$
(1.3
)
 
$
(0.8
)
 
$
(0.7
)