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Third-Party Reinsurance (Tables)
12 Months Ended
Dec. 31, 2024
Reinsurance Disclosures [Abstract]  
Effects of reinsurance The following table summarizes the effects of reinsurance on written and earned premiums and on loss and LAE for the Ark/WM Outrigger segment for the years ended December 31, 2024, 2023 and 2022.
Year Ended December 31,
Millions202420232022
Written premiums:
Direct$1,101.5 $931.9 $760.4 
Assumed1,105.5 966.5 691.6 
Gross written premiums2,207.0 1,898.4 1,452.0 
Ceded(527.9)
(1)
(377.5)
(1)
(256.8)
Net written premiums$1,679.1 $1,520.9 $1,195.2 
Earned premiums:
Direct$1,004.2 $848.1 $655.5 
Assumed1,088.2 925.6 668.7 
Gross earned premiums2,092.4 1,773.7 1,324.2 
Ceded(504.6)
(2)
(364.0)
(2)
(280.8)
Net earned premiums$1,587.8 $1,409.7 $1,043.4 
Loss and LAE:
Gross$1,056.7 $782.5 $814.9 
Ceded(200.9)
(3)
(55.7)
(3)
(278.5)
Net loss and LAE$855.8 $726.8 $536.4 
(1) The years ended December 31, 2024 and 2023 exclude $86.5 and $110.0 ceded by Ark to WM Outrigger Re, which eliminate in White Mountains’s consolidated financial statements.
(2) The years ended December 31, 2024 and 2023 exclude $88.0 and $104.3 ceded by Ark to WM Outrigger Re, which eliminate in White Mountains’s consolidated financial statements.
(3) The years ended December 31, 2024 and 2023 exclude $29.9 and $15.6 ceded by Ark to WM Outrigger Re, which eliminate in White Mountains’s consolidated financial statements.
The following table presents the Ark/WM Outrigger segment’s reinsurance recoverables as of December 31, 2024 and December 31, 2023:
Millions
December 31, 2024December 31, 2023
Reinsurance recoverables on unpaid losses (1)
$434.4 $340.8 
Reinsurance recoverables on paid losses (2)
57.5 27.4 
Ceded unearned premiums (3)
97.1 73.8 
Reinsurance recoverables
$589.0 $442.0 
(1) The reinsurance recoverables on unpaid losses exclude $31.8 and $15.6 ceded by Ark to WM Outrigger Re as of December 31, 2024 and 2023, which eliminate in White Mountains’s consolidated financial statements.
(2) The reinsurance recoverables on paid losses exclude $3.1 ceded by Ark to WM Outrigger Re as of December 31, 2024, which eliminates in White Mountains’s consolidated financial statements.
(3) The ceded unearned premiums exclude $4.3 and $5.7 ceded by Ark to WM Outrigger Re as of December 31, 2024 and 2023, which eliminate in White Mountains’s consolidated financial statements.
The following tables present gross written premiums and gross earned premiums included in the HG Global segment for the years ended December 31, 2024, 2023 and 2022:
Year Ended December 31, 2024
MillionsHG GlobalBAMEliminationsTotal
Written premiums:
Direct$ $24.1 $ $24.1 
Assumed52.4  (20.5)31.9 
Gross written premiums (1)
$52.4 $24.1 $(20.5)$56.0 
Earned premiums:
Direct$ $15.8 $ $15.8 
Assumed28.9 1.0 (14.0)15.9 
Gross earned premiums (1)
$28.9 $16.8 $(14.0)$31.7 
(1) Subsequent to the deconsolidation of BAM, there are no ceded premiums, such that gross written premiums and gross earned premiums are equivalent to net written premiums and net earned premiums, respectively. For the six months ended June 30, 2024, BAM ceded written premiums of $20.5 and ceded earned premiums of $14.0 to HG Global, which eliminated in consolidation.
Year Ended December 31, 2023
MillionsHG GlobalBAMEliminationsTotal
Written premiums:
Direct$— $58.6 $— $58.6 
Assumed50.1 — (50.1)— 
Gross written premiums (1)
$50.1 $58.6 $(50.1)$58.6 
Earned premiums:
Direct$— $28.7 $— $28.7 
Assumed26.0 2.5 (26.0)2.5 
Gross earned premiums (1)
$26.0 $31.2 $(26.0)$31.2 
(1) For the year ended December 31, 2023, BAM ceded written premiums of $50.1 and ceded earned premiums of $26.0 to HG Global, which eliminated in consolidation.
Year Ended December 31, 2022
MillionsHG GlobalBAMEliminationsTotal
Written premiums:
Direct$— $63.8 $— $63.8 
Assumed55.9 1.3 (55.9)1.3 
Gross written premiums (1)
$55.9 $65.1 $(55.9)$65.1 
Earned premiums:
Direct$— $28.6 $— $28.6 
Assumed27.5 4.7 (27.5)4.7 
Gross earned premiums (1)
$27.5 $33.3 $(27.5)$33.3 
(1) For the year ended December 31, 2022, BAM ceded written premiums of $55.9 and ceded earned premiums of $27.5 to HG Global, which eliminated in consolidation.
Gross and net reinsurance recoverables by reinsurers ratings
The following table presents the Ark/WM Outrigger segment’s gross and net reinsurance recoverables by the reinsurers’ A.M. Best Company, Inc (“A.M. Best”) ratings as of December 31, 2024:

$ in MillionsAs of December 31, 2024
A.M. Best Rating (1)
Gross CollateralNet % of Total
A+ or better$310.3 $— $310.3 74.3 %
A- to A
98.5— 98.523.6 
B++ or lower and not rated83.1
(2)
74.5
(2)
8.62.1 
Total$491.9 $74.5 $417.4 100.0 %
(1) A.M. Best financial strength ratings as detailed above are: “A+ or better” (Superior) “A- to A” (Excellent), “B++” (Good).
(2) Excludes $34.9 ceded by Ark to WM Outrigger Re as of December 31, 2024, which eliminates in White Mountains’s consolidated financial statements.