XML 79 R64.htm IDEA: XBRL DOCUMENT
v3.20.4

Goodwill - Summary of Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |
Gross cost, beginning balance | $ 599.5 | $ 601.4
Accumulated impairment losses, beginning balance | (236.5) | (236.5)
Net book amount, beginning balance | 363.0 | 364.9
Exchange effect | 8.2 | (1.9)
Gross cost, ending balance | 371.2 | 599.5
Accumulated impairment losses, ending balance | (0.0) | (236.5)
Net book amount, ending balance | 371.2 | 363.0
Fuel Specialties [Member] |  |
Goodwill [Line Items] |  |
Gross cost, beginning balance | 207.7 | 207.9
Accumulated impairment losses, beginning balance | (0.0) | (0.0)
Net book amount, beginning balance | 207.7 | 207.9
Exchange effect | 0.2 | (0.2)
Gross cost, ending balance | 207.9 | 207.7
Accumulated impairment losses, ending balance | (0.0) | (0.0)
Net book amount, ending balance | 207.9 | 207.7
Performance Chemicals [Member] |  |
Goodwill [Line Items] |  |
Gross cost, beginning balance | 110.5 | 112.2
Accumulated impairment losses, beginning balance | (0.0) | (0.0)
Net book amount, beginning balance | 110.5 | 112.2
Exchange effect | 8.0 | (1.7)
Gross cost, ending balance | 118.5 | 110.5
Accumulated impairment losses, ending balance | (0.0) | (0.0)
Net book amount, ending balance | 118.5 | 110.5
Oilfield Services [Member] |  |
Goodwill [Line Items] |  |
Gross cost, beginning balance | 44.8 | 44.8
Accumulated impairment losses, beginning balance | (0.0) | (0.0)
Net book amount, beginning balance | 44.8 | 44.8
Exchange effect | 0.0 | 0.0
Gross cost, ending balance | 44.8 | 44.8
Accumulated impairment losses, ending balance | (0.0) | (0.0)
Net book amount, ending balance | 44.8 | 44.8
Octane Additives [Member] |  |
Goodwill [Line Items] |  |
Gross cost, beginning balance | 236.5 | 236.5
Accumulated impairment losses, beginning balance | (236.5) | (236.5)
Net book amount, beginning balance | 0.0 | 0.0
Exchange effect | 0.0 | 0.0
Gross cost, ending balance | 0.0 | 236.5
Accumulated impairment losses, ending balance | (0.0) | (236.5)
Net book amount, ending balance | $ 0.0 | $ 0.0

X
- Definition Amount after accumulated impairment loss of an asset representing 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before accumulated impairment loss of an asset representing 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated impairment loss for an asset representing 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iosp_FuelSpecialtiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iosp_PerformanceChemicalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iosp_OilfieldServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iosp_OctaneAdditivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |