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Summary of Significant Accounting Policies (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Warranty Costs and Deferred Revenue      
Period for which products are warranted to be free from defect 1 year    
Shipping and handling costs      
Shipping and handling costs $ 26.2us-gaap_ShippingHandlingAndTransportationCosts $ 26.7us-gaap_ShippingHandlingAndTransportationCosts $ 30.5us-gaap_ShippingHandlingAndTransportationCosts
Advertising      
Advertising expenses $ 10.7us-gaap_AdvertisingExpense $ 9.6us-gaap_AdvertisingExpense $ 7.5us-gaap_AdvertisingExpense