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Employee Benefit Plans and Other Postretirement Benefits (Schedule Of Pension Plans With PBO And ABO In Excess Of Fair value Of Plan Assets) (Details) - Pension Plan Assets - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract] |  |
PBO | $ 1,934.1 | $ 1,964.0
Fair value of plan assets | $ 1,899.9 | $ 1,842.0

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