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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Acquisitions [Abstract]    
Amount of cash consideration paid for acquisitions, net of cash acquired $ 1.5 $ 0
Estimated amortization expense, remainder of the current fiscal year 26.9  
Estimated amortization expense, 2013 31.2  
Estimated amortization expense, 2014 26.2  
Estimated amortization expense, 2015 22.4  
Estimated amortization expense, 2016 19.4  
Estimated amortization expense, 2017 $ 17.8