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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Non-financial assets (Level 3 measurement):
Goodwill	$ 140.8	$ 141.5	$ 142.6
Octane Additives [Member]
Non-financial assets (Level 3 measurement):
Goodwill	1.8		3.5
Carrying amount [Member]
Non-derivatives:
Cash and cash equivalents	105.8	76.2
Short-term investments	4.7	4.8
Non-financial assets (Level 3 measurement):
Goodwill	1.8	2.6
Derivatives (Level 1 measurement):
Other non-current assets - commodity swaps	0	0.2
Non-derivatives:
Long-term debt (including current portion)	40.0	35.0
Non-financial liabilities (Level 3 measurement):
Plant closure provisions - remediation	27.3	27.1
Carrying amount [Member] | Interest rate swaps [Member]
Derivatives (Level 1 measurement):
Derivative Liabilities	0	0.1
Carrying amount [Member] | Commodity Swaps [Member]
Derivatives (Level 1 measurement):
Derivative Liabilities	0.1		0
Carrying amount [Member] | Foreign currency forward exchange contracts [Member]
Derivatives (Level 1 measurement):
Derivative Liabilities	0.1	0.5
Fair value [Member]
Non-derivatives:
Cash and cash equivalents	105.8	76.2
Short-term investments	4.7	4.8
Non-financial assets (Level 3 measurement):
Goodwill	1.8	2.6
Derivatives (Level 1 measurement):
Other non-current assets - commodity swaps	0	0.2
Non-derivatives:
Long-term debt (including current portion)	40.0	35.0
Non-financial liabilities (Level 3 measurement):
Plant closure provisions - remediation	27.3	27.1
Fair value [Member] | Interest rate swaps [Member]
Derivatives (Level 1 measurement):
Derivative Liabilities	0	0.1
Fair value [Member] | Commodity Swaps [Member]
Derivatives (Level 1 measurement):
Derivative Liabilities	0.1		0
Fair value [Member] | Foreign currency forward exchange contracts [Member]
Derivatives (Level 1 measurement):
Derivative Liabilities	$ 0.1	$ 0.5

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