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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill | The following table analyzes goodwill movement for 2019 and 2018.
( in millions ) |  | Fuel Specialties |  |  | Performance Chemicals |  |  | Oilfield Services |  |  | Octane Additives |  |  | Total |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross cost (1) |  | $ | 207.9 |  |  | $ | 116.6 |  |  | $ | 37.3 |  |  | $ | 236.5 |  |  | $ | 598.3 |
Accumulated impairment losses |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  | (236.5 | ) |  |  | (236.5 | )
Net book amount |  | $ | 207.9 |  |  | $ | 116.6 |  |  | $ | 37.3 |  |  | $ | 0.0 |  |  | $ | 361.8 |
Exchange effect |  |  | 0.0 |  |  |  | (4.4 | ) |  |  | 0.0 |  |  |  | 0.0 |  |  |  | (4.4 | )
Acquisition |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 7.5 |  |  |  | 0.0 |  |  |  | 7.5 |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross cost (1) |  | $ | 207.9 |  |  | $ | 112.2 |  |  | $ | 44.8 |  |  | $ | 236.5 |  |  | $ | 601.4 |
Accumulated impairment losses |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  | (236.5 | ) |  |  | (236.5 | )
Net book amount |  | $ | 207.9 |  |  | $ | 112.2 |  |  | $ | 44.8 |  |  | $ | 0.0 |  |  | $ | 364.9 |
Exchange effect |  |  | (0.2 | ) |  |  | (1.7 | ) |  |  | 0.0 |  |  |  | 0.0 |  |  |  | (1.9 | )
At December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross cost (1) |  | $ | 207.7 |  |  | $ | 110.5 |  |  | $ | 44.8 |  |  | $ | 236.5 |  |  | $ | 599.5 |
Accumulated impairment losses |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |  |  |  | (236.5 | ) |  |  | (236.5 | )
Net book amount |  | $ | 207.7 |  |  | $ | 110.5 |  |  | $ | 44.8 |  |  | $ | 0.0 |  |  | $ | 363.0 |
(1) | Gross cost is net of $8.7 million, $0.3 million and $289.5 million of historical accumulated amortization in respect of the Fuel Specialties, Performance Chemicals and Octane Additives reporting segments, respectively .

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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