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Debt (Tables)
 3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Schedule of debt outstanding
The following table presents White Mountains’s debt outstanding as of March 31, 2024 and December 31, 2023:
$ in MillionsMarch 31, 2024Effective
  Rate
 (1)
December 31, 2023Effective
  Rate
 (1)
Ark 2007 Subordinated Notes, carrying value$— $30.0 
Ark 2021 Subordinated Notes Tranche 142.4 42.7 
Ark 2021 Subordinated Notes Tranche 247.0 47.0 
Ark 2021 Subordinated Notes Tranche 370.0 70.0 
Unamortized issuance cost(4.0)(4.2)
Ark 2021 Subordinated Notes, carrying value155.4 155.5 
    Total Ark Subordinated Notes, carrying value155.4 13.1%185.5 11.0%
HG Global Senior Notes (2)
150.0 11.9%150.0 11.9%
Unamortized discount and issuance cost(3.0)(3.1)
HG Global Senior Notes, carrying value147.0 146.9 
Kudu Credit Facility210.3 10.6%210.3 10.1%
Unamortized issuance cost(6.5)(6.5)
Kudu Credit Facility, carrying value203.8 203.8 
Other Operations debt26.4 10.2%28.9 10.2%
Unamortized issuance cost(.5)(.5)
Other Operations debt, carrying value25.9 28.4 
Total debt$532.1 $534.6 
 (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 cap.
The following table presents the change in debt under the Kudu Credit Facility for the three months ended March 31, 2024 and 2023:

Three Months Ended March 31,
Millions20242023
Kudu Credit Facility
Beginning balance$210.3 $215.2 
Term loans
Borrowings — — 
Repayments— (16.9)
Ending balance$210.3 $198.3