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Debt (Tables)
 9 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Schedule of debt outstanding
The following table presents White Mountains’s debt outstanding as of September 30, 2024 and December 31, 2023:
$ in MillionsSeptember 30, 2024Effective
  Rate
 (1)
December 31, 2023Effective
  Rate
 (1)
Ark 2007 Subordinated Notes, carrying value$— $30.0 
Ark 2021 Subordinated Notes Tranche 143.6 42.7 
Ark 2021 Subordinated Notes Tranche 247.0 47.0 
Ark 2021 Subordinated Notes Tranche 370.0 70.0 
Unamortized issuance cost(3.8)(4.2)
Ark 2021 Subordinated Notes, carrying value156.8 155.5 
    Total Ark Subordinated Notes, carrying value156.8 12.1%185.5 11.0%
HG Global Senior Notes (2)
150.0 11.8%150.0 11.9%
Unamortized discount and issuance cost(2.7)(3.1)
HG Global Senior Notes, carrying value147.3 146.9 
Kudu Credit Facility (2)
225.3 10.5%210.3 10.1%
Unamortized issuance cost(6.8)(6.5)
Kudu Credit Facility, carrying value218.5 203.8 
Other Operations debt22.6 10.1%28.9 10.2%
Unamortized issuance cost(.3)(.5)
Other Operations debt, carrying value22.3 28.4 
Total debt$544.9 $564.6 
 (1) Effective rate includes the effect of the amortization of debt issuance costs and, where applicable, the original issue discount.
(2) Effective rate excludes the effect of the interest rate caps.
The following table presents the change in debt under the Kudu Credit Facility for the three and nine months ended September 30, 2024 and 2023:

Three Months Ended September 30,Nine Months Ended September 30,
Millions2024202320242023
Kudu Credit Facility
Beginning balance$210.3 $210.3 $210.3 $215.2 
Term loans
Borrowings 15.0 — 15.0 12.0 
Repayments— — — (16.9)
Ending balance$225.3 $210.3 $225.3 $210.3