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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 |

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