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Intangible Assets (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets (Textual) [Abstract]
Intangible asset	$ 54.7	$ 48.3	$ 54.7	$ 48.3	$ 51.2	$ 48.1
Amortization expense	1.0	1.1	2.0	2.3
Ethyl [Member]
Intangible Assets (Textual) [Abstract]
Intangible asset	22.1		22.1
Amortization expense			0.7	1.0
Others [Member]
Intangible Assets (Textual) [Abstract]
Assets being amortized duration			13 years
Intangible asset	26.0		26.0
Amortization expense			0.5	0.5
Others, amortization recognized in selling, general and administrative expenses [Member]
Intangible Assets (Textual) [Abstract]
Amortization expense			0.8	0.8
Internally Developed Software and Other Costs [Member]
Intangible Assets (Textual) [Abstract]
Intangible asset	6.6	0	6.6	0
Amortization expense			$ 0	$ 0

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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