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Pension Plans And Other Post Retirement Benefits (Schedule Of Weighted-Average Key Assumptions Used For CDT Pension Plan) (Details) (CDT Pension Plan [Member])
 6 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]    
Salary increases 2.25% 2.25%
Pension increases 1.75% 1.50%
Discount rate 5.30% 5.25%
To Age 30 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Employee fluctuation rate 1.00% 1.00%
To Age 35 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Employee fluctuation rate 0.50% 0.50%
To Age 40 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Employee fluctuation rate 0.00% 0.00%
To Age 45 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Employee fluctuation rate 0.50% 0.50%
To Age 50 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Employee fluctuation rate 0.50% 0.50%
From Age 51 [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Employee fluctuation rate 1.00% 1.00%