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Postretirement Benefits Other Than Pensions - Benefit Payments Net, Modernization Act Subsidy (Details) - Other Postretirement Benefit Plan, Defined Benefit [Member] $ in Millions | Dec. 31, 2018 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Excluding Medicare Part D Subsidy Year One | $ 1.7
Expected Medicare Part D Subsidy, Year One | 0.0
Net OPEB Benefits Year One | 1.7
Excluding Medicare Part D Subsidy, Year Two | 1.6
Expected Medicare Part D Subsidy, Year Two | 0.0
Net OPEB Benefits Year Two | 1.6
Excluding Medicare Part D Subsidy, Year Three | 1.5
Expected Medicare Part D Subsidy, Year Three | 0.0
Net OPEB Benefits Year Three | 1.5
Excluding Medicare Part D Subsidy, Year Four | 1.6
Expected Medicare Part D Subsidy, Year Four | 0.0
Net OPEB Benefits Year Four | 1.6
Excluding Medicare Part D Subsidy, Year Five | 1.5
Expected Medicare Part D Subsidy, Year Five | 0.0
Net OPEB Benefits Year Five | 1.5
Excluding Medicare Part D Subsidy Fiscal Years Thereafter | 6.2
Expected Medicare Part D Subsidy, Five Fiscal Years Thereafter | 0.0
Net OPEB Benefits Five Fiscal Years Thereafter | $ 6.2

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