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Goodwill and Other Intangible Assets - Intangible Assets Deemed to Indefinite Life that are Therefore Not Amortized (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | $ 34.1 | $ 35.8
Operating Permits |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 6.6 | 6.6
Use Rights |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 25.0 | 26.7
Trade names |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 2.5 | 2.5
Building Materials Business |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 31.6 | 33.3
Building Materials Business | Operating Permits |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 6.6 | 6.6
Building Materials Business | Use Rights |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 25.0 | 26.7
Building Materials Business | Trade names |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 0.0 | 0.0
Magnesia Specialties |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 2.5 | 2.5
Magnesia Specialties | Operating Permits |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 0.0 | 0.0
Magnesia Specialties | Use Rights |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | 0.0 | 0.0
Magnesia Specialties | Trade names |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Indefinite life intangible assets | $ 2.5 | $ 2.5

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- 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
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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