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Schedule V - Valuation And Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reserve Deducted From Accounts Receivable |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | $ 21.3 | $ 14.0 | $ 14.0
Additions Charged to costs and expenses |  | 8.1 | 11.4 | 4.5
Additions Charged to other accounts |  | 0.0 | 0.0 | 0.0
Deductions from reserve | [1] | 7.6 | 4.1 | 4.5
Balance at end of period |  | 21.8 | 21.3 | 14.0
Reserve For Known And Incurred But Not Reported Claims |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 1,325.3 | 1,283.8 | 1,178.0
Additions Charged to costs and expenses |  | 336.3 | 486.3 | 588.7
Additions Charged to other accounts |  | 2.6 | (10.5) | (0.6)
Deductions from reserve | [2] | 381.8 | 434.3 | 482.3
Balance at end of period |  | 1,282.4 | 1,325.3 | 1,283.8
Reserve deducted from notes receivable |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 6.8 | 0.3 | 0.3
Additions Charged to costs and expenses |  | 0.0 | 27.7 | 0.0
Additions Charged to other accounts |  | 0.0 | 0.0 | 0.0
Deductions from reserve |  | 6.5 | 21.2 | 0.0
Balance at end of period |  | 0.3 | 6.8 | 0.3
Reserve Deducted From Deferred Income Taxes |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 7.4 | 8.1 | 9.4
Additions Charged to costs and expenses |  | 7.6 | 0.0 | 0.0
Additions Charged to other accounts |  | 0.0 | 0.0 | 0.0
Deductions from reserve |  | 1.3 | 0.7 | 1.3
Balance at end of period |  | $ 13.7 | $ 7.4 | $ 8.1
[1] | Amount represents accounts written off, net of recoveries.
[2] | Amount represents claim payments, net of recoveries.

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