Annual report pursuant to Section 13 and 15(d)

Leases (Narrative) (Details)

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Leases (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Leases [Abstract]      
Number of real estate leases 77    
Number of assets under operating lease 216    
Aggregate expense under operating leases $ 19.5 $ 21.0 $ 20.5