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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 9 Months Ended
Sep. 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 nine and three months ended September 30, 2020 and 2019 were:
 Nine Months EndedThree Months Ended
(Dollars in Millions)Sep 30,
2020		Sep 30,
2019		Sep 30,
2020		Sep 30,
2019
Interest Cost on Projected Benefit Obligation$13.5 $16.8 $4.5 $5.6 
Expected Return on Plan Assets(22.0)(22.9)(7.3)(7.6)
Amortization of Net Actuarial Loss4.6 2.2 1.6 0.7 
Total Pension Benefit Recognized$(3.9)$(3.9)$(1.2)$(1.3)
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, 2020 and 2019 were:
 Nine Months EndedThree Months Ended
(Dollars in Millions)Sep 30,
2020		Sep 30,
2019		Sep 30,
2020		Sep 30,
2019
Service Cost$0.1 $0.1 $— $— 
Interest Cost on Accumulated Postretirement Benefit Obligation0.2 0.3 — — 
Amortization of Prior Service Credit(0.9)(1.0)(0.2)(0.3)
Amortization of Net Gain(1.4)(1.8)(0.4)(0.8)
Total OPEB Benefit Recognized$(2.0)$(2.4)$(0.6)$(1.1)