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Postretirement Benefits Other Than Pensions - Benefit Payments Net, Modernization Act Subsidy (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Excluding Modernization Act Subsidy Year One $ 4.8
Expected Modernization Act Subsidy, Year One (0.5)
Net OPEB Benefits Year One 4.3
Excluding Modernization Act Subsidy Year Two 4.8
Expected Modernization Act Subsidy, Year Two (0.5)
Net OPEB Benefits Year Two 4.3
Excluding Modernization Act Subsidy Year Three 4.8
Expected Modernization Act Subsidy, Year Three (0.6)
Net OPEB Benefits Year Three 4.2
Excluding Modernization Act Subsidy Year Four 4.7
Expected Modernization Act Subsidy, Year Four (0.6)
Net OPEB Benefits Year Four 4.1
Excluding Modernization Act Subsidy Year Five 4.6
Expected Modernization Act Subsidy, Year Five (0.6)
Net OPEB Benefits Year Five 4.0
Excluding Modernization Act Subsidy Five Fiscal Years Thereafter 19.3
Expected Modernization Act Subsidy, Five Fiscal Years Thereafter (2.4)
Net OPEB Benefits Five Fiscal Years Thereafter $ 16.9