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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Royalty Income [Abstract]      
Royalty Income $ 11.2 $ 12.4 $ 17.0
Foreign Currency Translation [Abstract]      
Foreign Currency Transaction Gain From Remeasurement and Settlement 1.3    
Foreign Currency Transaction Loss From Remeasurement and Settlement   1.4 1.6
Acquisition Costs 1.1    
Capitalized Computer Software [Abstract]      
Capitalized Computer Software, Useful Life 7 years    
Capitalized Computer Software, Amortization 4.8 6.6 6.8
Capitalized Computer Software, Accumulated Amortization $ 60.9 $ 56.1  
China [Member]
     
Principles of Consolidation [Abstract]      
Number of Joint Ventures 2    
Equity Method Investment, Ownership Percentage 50.00%    
China [Member] | CTM [Member]
     
Principles of Consolidation [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Restricted Stock Performance Plan [Member] | Minimum [Member]
     
Capitalized Computer Software [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 2 years    
Restricted Stock Performance Plan [Member] | Maximum [Member]
     
Capitalized Computer Software [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 3 years