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Stock-Based Compensation (Summary Of Performance Share Unit Activity) (Details) (Performance share units [Member])
 12 Months Ended 1 Months Ended
Jan. 31, 2015
Mar. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, beginning of year (in shares) 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber [1]  
Granted units (in shares or units) 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod [1]  
Vested units (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod [1]  
Forfeited or cancelled (in shares) (100,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations [1]  
Outstanding, end of year (in shares) 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber [1],[2]  
Vesting rate of the number of units granted 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage  
Subsequent Event [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested units (in shares)   (48,229)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Vesting rate of the number of units granted   75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
[1] Assumes performance share units at 100% of the number of units granted.
[2] On February 13, 2015, the Compensation Committee of our Board of Directors approved the vesting of 48,229 performance share units that were granted in 2012 and outstanding as of January 31, 2015. Those units were earned and vested at 75% based on the defined performance criteria above. For purposes of this footnote only, performance share units are stated in exact units instead of millions.