Business and Geographic Segments - Net Property and Equipment by Segment (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net property and equipment:
Net property and equipment	$ 517.3	$ 523.8	$ 563.6
United States
Net property and equipment:
Net property and equipment	40.0	45.8	63.6
Germany
Net property and equipment:
Net property and equipment	213.0	204.7	214.8
Belgium
Net property and equipment:
Net property and equipment	98.5	101.4	107.7
Norway
Net property and equipment:
Net property and equipment	83.5	83.6	86.4
Canada
Net property and equipment:
Net property and equipment	$ 82.3	$ 88.3	$ 91.1

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Topic 360
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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Balance Type:	debit
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