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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Recurring Fair Value Measurements
M
Dec. 31, 2011
Recurring Fair Value Measurements
Total
Dec. 31, 2010
Recurring Fair Value Measurements
Total
Dec. 31, 2011
Recurring Fair Value Measurements
Quoted Prices in Active Markets for Identical Assets (Level 1)
Dec. 31, 2010
Recurring Fair Value Measurements
Quoted Prices in Active Markets for Identical Assets (Level 1)
Dec. 31, 2011
Recurring Fair Value Measurements
Significant Unobservable Inputs (Level 3)
Fair value measurements                
Cash and cash equivalents       $ 74.7 $ 89.4 $ 74.7 $ 89.4  
Short-term investments       0.6 5.4 0.6 5.4  
Total assets measured at fair value       75.3 94.8 75.3 94.8  
Contingent consideration       5.2       5.2
Total liabilities measured at fair value       5.2       5.2
Short-term investments held in mutual funds 0.6              
Short-term investments held in euro-denominated certificates of deposit   5.3            
Short-term investments held in mutual funds and as cash for the Company's deferred compensation program   $ 0.1            
Maximum term of original maturity to classify certificates of deposit as short-term investments (in months)     3