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Description of Business and Significant Accounting Policies (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Short-Term Investments      
Maturity period of short-term investments, minimum 3 months    
Accounts Receivable, Net      
Allowance for doubtful accounts $ 2.4 $ 0.5  
Goodwill and Indefinite-Lived Intangibles      
Number of reporting units 5    
Number of reportable segments 2    
Trading days prior to measurement date 10 days    
Warranty Costs      
Warranty period 1 year    
Advertising Expense      
Advertising expenses $ 0.5 $ 0.8 $ 1.4
Negotiable Letters of Credit      
Maturity period of irrevocable letters of credit, minimum 0 days    
Maturity period of irrevocable letters of credit, maximum 90 days    
Maximum
      
Definite-Lived Intangible and Long-Lived Assets      
Estimated useful lives 17 years