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Schedule V - Valuation And Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reserve Deducted From Accounts Receivable |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | $ 21.8 | $ 21.3 | $ 14.0
Additions Charged to costs and expenses |  | 8.7 | 8.1 | 11.4
Additions Charged to other accounts |  | 0.0 | 0.0 | 0.0
Deductions from reserve | [1] | 9.0 | 7.6 | 4.1
Balance at end of period |  | 21.5 | 21.8 | 21.3
Reserve For Known And Incurred But Not Reported Claims |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 1,282.4 | 1,325.3 | 1,283.8
Additions Charged to costs and expenses |  | 320.0 | 336.3 | 486.3
Additions Charged to other accounts |  | (11.2) | 2.6 | (10.5)
Deductions from reserve | [2] | 397.8 | 381.8 | 434.3
Balance at end of period |  | 1,193.4 | 1,282.4 | 1,325.3
Reserve deducted from notes receivable |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 0.3 | 6.8 | 0.3
Additions Charged to costs and expenses |  | 1.7 | 0.0 | 27.7
Additions Charged to other accounts |  | 0.0 | 0.0 | 0.0
Deductions from reserve |  | 0.0 | 6.5 | 21.2
Balance at end of period |  | 2.0 | 0.3 | 6.8
Reserve Deducted From Deferred Income Taxes |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 13.7 | 7.4 | 8.1
Additions Charged to costs and expenses |  | 15.6 | 7.6 | 0.0
Additions Charged to other accounts |  | 0.0 | 0.0 | 0.0
Deductions from reserve |  | 1.4 | 1.3 | 0.7
Balance at end of period |  | $ 27.9 | $ 13.7 | $ 7.4
[1] | Amount represents accounts written off, net of recoveries.
[2] | Amount represents claim payments, net of recoveries.

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