Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Benefit Plans [Abstract]      
Company contributions $ 13.9 $ 7.6 $ 4.8
Deferred compensation plan amounts owed $ 24.6 $ 22.3