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Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Valuation of financial instruments recorded on fair value basis    
Currency forward contracts $ (0.1) $ (0.8)
Current marketable securities (See Note 2)   20.9
Noncurrent marketable securities (See Note 2) 69.6 98.4
Quoted Prices In Active Markets (Level 1) [Member]
   
Valuation of financial instruments recorded on fair value basis    
Currency forward contracts (0.1) (0.8)
Current marketable securities (See Note 2)   20.9
Noncurrent marketable securities (See Note 2) 69.6 98.4
Significant Other Observable Inputs (Level 2) [Member]
   
Valuation of financial instruments recorded on fair value basis    
Currency forward contracts     
Noncurrent marketable securities (See Note 2)     
Significant Unobservable Inputs (Level 3) [Member]
   
Valuation of financial instruments recorded on fair value basis    
Currency forward contracts     
Noncurrent marketable securities (See Note 2)