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Restructuring (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Restructuring        
One time charges of restructuring cost     $ 7.4  
Restructuring costs incurred 0.2 0.3    
Additional cost recorded for cancellation of outstanding stock options for certain terminated employees   0.4    
Restructuring cost paid   2.9    
Restructuring liability $ 2.1 $ 2.1 $ 2.1 $ 4.8