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Equity Securities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |  |
Realized and unrealized net gains (losses) on equity securities | $ 54.9 | $ (262.5) |
Net unrealized gains on equity securities | 51.2 | (237.2) |
Cash proceeds from sale of equity securities | 71.0 | 241.4 | $ 171.8
Offerpad Inc [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Net unrealized gains on equity securities | 12.7 | (190.9) |
Payment to purchase additional shares of common stock | 25.0 |  |
Investment cost | 110.0 | 85.0 |
Investment fair value | 52.5 | 14.8 |
Non Marketable Equity Securities |  |  |
Schedule Of Investments [Line Items] |  |  |
Cumulative unrealized losses and impairment charges | 322.4 | 153.2 |
Cumulative unrealized gains | $ 243.3 | 241.8 |
Realized gain on securities |  | 51.1 |
Cash proceeds from sale of equity securities |  | $ 63.0 |

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