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Schedule III - Income Statement Captions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Supplementary Insurance Information By Segment [Line Items]      
Premiums and escrow fees $ 5,007.9 $ 4,701.4 $ 6,632.4
Net investment income (1) [1] 159.4 363.6 (175.7)
Loss provision 320.0 336.3 486.3
Amortization of deferred policy acquisition costs (credits) (1.4) (0.2) 4.3
Other operating expenses 1,113.4 1,067.0 1,272.3
Premiums written 411.3 398.4 393.9
Operating Segments | Title Insurance and Services      
Supplementary Insurance Information By Segment [Line Items]      
Premiums and escrow fees 4,610.2 4,305.7 6,210.5
Net investment income (1) [1] 188.9 502.0 209.3
Loss provision 138.3 139.9 248.4
Amortization of deferred policy acquisition costs (credits) 0.0 0.0 0.0
Other operating expenses 992.5 937.7 1,155.4
Premiums written 0.0 0.0 0.0
Operating Segments | Home Warranty      
Supplementary Insurance Information By Segment [Line Items]      
Premiums and escrow fees 397.8 395.6 413.1
Net investment income (1) [1] 5.4 (0.1) (7.4)
Loss provision 184.4 193.1 211.8
Amortization of deferred policy acquisition costs (credits) (1.4) (0.2) 1.9
Other operating expenses 86.0 82.8 75.7
Premiums written 411.3 398.4 394.9
Operating Segments | Corporate and Eliminations      
Supplementary Insurance Information By Segment [Line Items]      
Premiums and escrow fees (0.1) 0.1 8.8
Net investment income (1) [1] (34.9) (138.3) (377.6)
Loss provision (2.7) 3.3 26.1
Amortization of deferred policy acquisition costs (credits) 0.0 0.0 2.4
Other operating expenses 34.9 46.5 41.2
Premiums written $ 0.0 $ 0.0 $ (1.0)
[1] Includes net investment income and net investment gains (losses).