Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Commitments And Contingencies [Abstract]      
Contingent liabilities $ 0    
Contingency reserve 0    
Expenses charged to operations $ 24.9 $ 24.7 $ 25.1