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Business Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Parenthetical) (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |
Gains on sales of investment land | $ 71.2 | $ 5.0
Land |  |
Segment Reporting Information [Line Items] |  |
Gains on sales of investment land | $ 69.9 |

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