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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, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Excluding Medicare Part D Subsidy Year One $ 1.8
Expected Medicare Part D Subsidy, Year One 0.0
Net OPEB Benefits Year One 1.8
Excluding Medicare Part D Subsidy, Year Two 1.8
Expected Medicare Part D Subsidy, Year Two 0.0
Net OPEB Benefits Year Two 1.8
Excluding Medicare Part D Subsidy, Year Three 1.7
Expected Medicare Part D Subsidy, Year Three 0.0
Net OPEB Benefits Year Three 1.7
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 5.9
Expected Medicare Part D Subsidy, Five Fiscal Years Thereafter 0.0
Net OPEB Benefits Five Fiscal Years Thereafter $ 5.9