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Investments (Details) (Keymark Enterprises, LLC, USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Equity Method Investment    
Equity method investment ownership percentage  46.10%40.60%
Remaining balance, loan and pledge agreement defaulted on by the other owner of Keymark   $ 0.7
Carrying value of software acquired11.5   
Net cash payments to purchase software assets6.2   
Income (loss) in equity method investment, before tax4.3   
Carrying value of investments1.0   
Loans made to other owner $ 0.5  
Initial ownership percentage
    
Equity Method Investment    
Equity method investment ownership percentage   40.60%
Ownership percentage adjustment due to default
    
Equity Method Investment    
Equity method investment ownership percentage  5.50%