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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 9 Months Ended
Sep. 30, 2019
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 nine and three months ended September 30, 2019 and 2018 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2019
 
Sep 30,
2018
 
Sep 30,
2019
 
Sep 30,
2018
Interest Cost on Projected Benefit Obligation
 
$
16.8

 
$
15.2

 
$
5.6

 
$
5.0

Expected Return on Plan Assets
 
(22.9
)
 
(21.7
)
 
(7.6
)
 
(7.3
)
Amortization of Net Actuarial Loss
 
2.2

 
3.2

 
0.7

 
1.1

Total Pension Benefit Recognized
 
$
(3.9
)
 
$
(3.3
)
 
$
(1.3
)
 
$
(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 nine and three months ended September 30, 2019 and 2018 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2019
 
Sep 30,
2018
 
Sep 30,
2019
 
Sep 30,
2018
Service Cost
 
$
0.1

 
$
0.1

 
$
—

 
$
—

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.3

 
0.3

 
—

 
0.1

Amortization of Prior Service Credit
 
(1.0
)
 
(1.4
)
 
(0.3
)
 
(0.5
)
Amortization of Net Gain
 
(1.8
)
 
(1.0
)
 
(0.8
)
 
(0.3
)
Total OPEB Benefit Recognized
 
$
(2.4
)
 
$
(2.0
)
 
$
(1.1
)
 
$
(0.7
)