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Equity Securities (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 28, 2023 | Dec. 31, 2022
Schedule Of Investments [Line Items] |  |  |  |
Net (losses) gains on equity securities | $ 12.4 | $ (65.0) |  |
Net unrealized gains and (losses) on equity securities | 11.7 | (64.7) |  |
Cash proceeds from sale of equity securities | 11.1 | 83.2 |  |
Carrying amount of investment | 8,452.1 |  |  | $ 8,987.2
Offerpad Inc [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Net unrealized gains and (losses) on equity securities | (44.0) |  |  |
Payment for warrants to purchase additional shares of common stock | 25.0 |  |  |
Warrants exercised to purchase shares of common stock |  |  | 44.7 |
Carrying amount of investment | 40.5 |  |  | $ 14.8
Non Marketable Equity Securities |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Impairment charges on equity securities | 12.9 |  |  |
Net unrealized losses on equity securities | $ 17.2 | 11.1 |  |
Investment In Insurance Business |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Realized gain on securities |  | 51.1 |  |
Cash proceeds from sale of equity securities |  | $ 63.0 |  |

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