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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Summary of Nonvested Shares Related To Long-Term Incentive Plan) (Details) (Performance Shares [Member], USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2013
Mar. 31, 2013
Performance Shares [Member]
   
Weighted-average Fair Value per Unit at Grant Date    
Weighted-average Fair Value per Unit, Nonvested at January 1, 2013 $ 33.56 $ 33.56
Weighted-average Fair Value per Unit, Grants $ 31.19 $ 31.19 [1]
Weighted-average Fair Value per Unit, Forfeitures   $ 32.67
Weighted-average Fair Value per Unit, Vested   $ 31.19 [2]
Weighted-average Fair Value per Unit, Nonvested at March 31, 2013   $ 32.68
Share Units    
Share Units, Nonvested at January 1, 2013 1,192,487 1,192,487
Share Units, Granted   832,034 [1]
Share Units, Forfeitures   (5,456)
Share Units, Vested   (122,671) [2]
Share Units, Nonvested at March 31, 2013   1,896,394
Performance period   3 years
[1] Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in January 2013 under the 2006 Plan
[2] Share units vested due to the attainment of retirement eligibility by certain employees. Actual shares issued for retirement-eligible employees will vary depending on actual performance over the three-year measurement period.