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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Commitments and Contingencies      
Total rental expense under operating leases $ 18.5 $ 15.8 $ 13.8
Future minimum lease payments under non-cancelable operating leases      
2012 18.4    
2013 14.1    
2014 10.7    
2015 8.5    
2016 6.5    
Thereafter 16.3    
Total 74.5    
Capital Leases      
Cost of the buildings under the capital leases 9.9 10.1  
Accumulated amortization of the leased buildings 2.6 2.2  
License Agreements      
Period for which other companies are allowed to utilize certain patents and related technologies under cross-licensing agreements, low end of range (in years) 21    
Period for which other companies are allowed to utilize certain patents and related technologies under cross-licensing agreements, high end of range (in years) 30    
Income from cross-licensing agreements 2.9 3.2 2.3
Royalties payable, if patents are used in connection with a commercial product sale, low end of range (as a percent) 0.15%    
Royalties payable, if patents are used in connection with a commercial product sale, high end of range (as a percent) 5.00%    
Licensing fees 2.8 1.8 2.1
Grants      
Amounts received under grants from government authorities in the U.S. and Germany 4.0 3.8 4.5
Total expenditures related to government grants $ 5.5 $ 4.5 $ 5.8