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Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2007
Summary of Other intangible assets      
Gross cost $ 106.2 $ 51.2  
Accumulated amortization (37.6) (33.5)  
Other Intangible Assets, Net 68.6 17.7  
Ethyl [Member]
      
Summary of Other intangible assets      
Gross cost 22.1 22.1 28.4
Accumulated amortization (16.6) (15.0)  
Technology [Member]
      
Summary of Other intangible assets      
Gross cost 7.1 7.1  
Accumulated amortization (6.0) (5.3)  
Customer relationships [Member]
      
Summary of Other intangible assets      
Gross cost 16.0 16.0  
Accumulated amortization (12.7) (11.2)  
Patents [Member]
      
Summary of Other intangible assets      
Gross cost 2.9 2.9  
Accumulated amortization (2.3) (2.0)  
Internally Developed Software and Other Costs [Member]
      
Summary of Other intangible assets      
Gross cost 10.1 3.1  
Accumulated amortization 0 0  
Strata Control Services Inc [Member]
      
Summary of Other intangible assets      
Gross cost $ 48.0 $ 0