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Fair Value Measurements - Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis (Detail) (Recurring [Member], USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying Amount [Member] |  |
Non-derivatives: |  |
Cash and cash equivalents | $ 54.7 | $ 22.4
Short-term investments | 4.3 | 5.1
Non-derivatives: |  |
Long-term debt (including current portion) | 33.0 | 30.0
Carrying Amount [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] |  |
Non-financial liabilities (Level 3 measurement): |  |
Acquisition-related contingent consideration | 4.5 | 4.3
Carrying Amount [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Octane Additives [Member] |  |
Non-financial assets (Level 3 measurement): |  |
Goodwill-Octane Additives | 0.6 | 1.3
Carrying Amount [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Phantom Share Units PSUs [Member] |  |
Non-financial liabilities (Level 3 measurement): |  |
Stock equivalent units | 9.5 | 12.6
Carrying Amount [Member] | Derivatives (Level 1 Measurement) [Member] |  |
Derivatives (Level 1 measurement): |  |
Other non-current assets: Commodity swaps | 0 | 0.1
Foreign currency forward exchange contracts | 0.1 | 0.8
Fair Value [Member] |  |
Non-derivatives: |  |
Cash and cash equivalents | 54.7 | 22.4
Short-term investments | 4.3 | 5.1
Non-derivatives: |  |
Long-term debt (including current portion) | 33.0 | 30.0
Fair Value [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] |  |
Non-financial liabilities (Level 3 measurement): |  |
Acquisition-related contingent consideration | 4.5 | 4.3
Fair Value [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Octane Additives [Member] |  |
Non-financial assets (Level 3 measurement): |  |
Goodwill-Octane Additives | 0.6 | 1.3
Fair Value [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Phantom Share Units PSUs [Member] |  |
Non-financial liabilities (Level 3 measurement): |  |
Stock equivalent units | 9.5 | 12.6
Fair Value [Member] | Derivatives (Level 1 Measurement) [Member] |  |
Derivatives (Level 1 measurement): |  |
Other non-current assets: Commodity swaps | 0 | 0.1
Foreign currency forward exchange contracts | $ 0.1 | $ 0.8

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- Details
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- Definition Stock equivalent units fair value disclosure. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Fair value as of the balance sheet date of foreign currency derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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