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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 9 Months Ended
Oct. 20, 2014
May 27, 2014
Apr. 29, 2014
Sep. 30, 2014
item
Commitments and Contingencies.        
Number of co-defendants against whom lawsuit was filed       4
Number of former employees engaged in anticompetitive activities       2
Amount of damages awarded to plaintiff   $ 153.5 $ 156.0  
Amount of damages expected to be trebled under the federal antitrust laws       52
Amount paid for settlement of claims 23.0      
Reasonable range of potential loss, low end of the range       $ 10.0