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v3.20.4

Business Combinations, Dispositions and Related Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Waste Management |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations | $ 4.9 |  |  |  |  | $ 58.4 |
Impairment of long lived assets held for use |  |  | $ 170.6 |  |  |  |
Gain from disposal of discontinued operations, net of tax |  |  |  |  |  | $ 34.7 |
Waste Management | Discontinued Operations |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations | 4.9 | $ 58.0 |  |  |  |  |
Gain from disposal of discontinued operations, net of tax | $ 4.3 | $ 34.7 |  |  |  |  |
Gain on disposal of discontinued operations, per diluted share, net of tax | $ 0.15 | $ 1.22 |  |  |  |  |
Kronos Worldwide, Inc. |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  | 2,000,000.0
Repurchased shares |  |  |  | 122,489 | 264,992 | 0 |
Shares available for purchase | 1,560,000 |  |  | 1,560,000 |  |  |
Stock repurchase, aggregate purchase price |  |  |  | $ 1.0 | $ 3.0 |  |
CompX | Class A |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |
Repurchased shares |  |  |  | 0 | 0 | 0 |
Shares available for purchase | 678,000 |  |  | 678,000 |  |  |

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