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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Annual maturities of long term debt:      
2012 $ 83.7    
2013 1.1    
2014 0.7    
2015 0.5    
2016 0.6    
Total 86.6    
Interest expense $ 7.3 $ 5.6 $ 7.5