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Pension and Postretirement Health and Life Benefits (Narrative) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Curtailment losses $ 1.9 $ 5.1
Defined Benefit Pension Plans [Member]
   
Expected defined benefit plan contributions for current fiscal year 14.6 14.6
Defined benefit plan contributions   9.0
Curtailment losses   3.2
Postretirement Health and Life Benefits Plans [Member]
   
Expected defined benefit plan contributions for current fiscal year 4.8 4.8
Defined benefit plan contributions   3.2
Curtailment losses $ 1.9 $ 1.9