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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) facility | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Contingencies And Commitments [Line Items] |  |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Environmental Liabilities | Environmental Liabilities |
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accrued liabilities – other | Accrued liabilities – other |
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other – net | Other – net |
Environmental Matters |  |  |
Contingencies And Commitments [Line Items] |  |  |
Pretax charge to comply U.S. federal, state and local environmental control and protection regulations | $ 20.0 | $ 17.5 | $ 16.3
Capital expenditure to comply environmental regulations | 1.6 | 3.1 | $ 1.2
Environmental reserves | 101.8 | 102.4 |
Environmental reserves included in current liabilities | $ 10.8 | 9.8 |
Government Operations | Environmental Matters |  |  |
Contingencies And Commitments [Line Items] |  |  |
Number of facilities | facility | 2 |  |
Financial assurance to pay expected cost of decommissioning | $ 68.1 | 61.8 |
Commercial Operations | Environmental Matters |  |  |
Contingencies And Commitments [Line Items] |  |  |
Financial assurance to pay expected cost of decommissioning | $ 43.3 | $ 46.4 |

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- Definition Financial assurance to pay expected cost of decommissioning. + References No definition available. + Details
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- Definition Number of former nuclear fuel processing facilities. + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(3) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 5: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 55 -Paragraph 16 -URI https://asc.fasb.org/extlink&oid=6571209&loc=d3e13703-110860 + Details
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