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Debt (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of debt outstanding
The following table presents White Mountains’s debt outstanding as of September 30, 2021 and December 31, 2020:
MillionsSeptember 30,
2021
Effective
  Rate
(1)December 31,
2020
Effective
  Rate
(1)
Ark 2007 Notes Tranche 1$30.0 $— 
Ark 2007 Notes Tranche 213.9 — 
Ark 2007 Subordinated Notes, carrying value43.9 — 
Ark 2021 Notes Tranche 145.3 — 
Ark 2021 Notes Tranche 247.0 — 
Ark 2021 Notes Tranche 370.0 — 
Unamortized issuance cost(5.5)
Ark 2021 Subordinated Notes, carrying value156.8 
    Total Ark Subordinated Notes, carrying value200.7 5.1%— 
NSM Bank Facility300.4 7.4%(2)277.4 7.5%(2)
Unamortized issuance cost(6.7)(6.1)
NSM Bank Facility, carrying value293.7 271.3 
Other NSM debt, carrying value1.3 3.3%1.3 2.5%
Kudu Credit Facility203.0 4.1%— 
Unamortized issuance cost(7.4)— 
Kudu Credit Facility, carrying value195.6 — 
Kudu Bank Facility 89.2 8.3%
Unamortized issuance cost (2.9)
Kudu Bank Facility, carrying value 86.3 
Other Operations debt19.5 7.4%18.0 7.4%
Unamortized issuance cost(.4)(.5)
Other Operations, carrying value19.1 17.5 
Total debt$710.4 $376.4 
 (1) Effective rate includes the effect of the amortization of debt issuance costs.
(2) NSM’s effective rate excludes the effect of the interest rate swap on the hedged portion of the debt. The weighted average interest rate for the quarter ended September 30, 2021 and December 31, 2020, excluding the effect of amortization of debt issuance costs, was 6.7% and 7.0%. The weighted average interest rate for the quarter ended September 30, 2021 and December 31, 2020 on the total NSM Bank Facility including both the effect of the amortization of debt issuance costs and the effect of the interest rate swap was 8.3% and 8.4%.
The following table presents the change in debt under the NSM Bank Facility for the three and nine months ended September 30, 2021 and 2020:
NSM Bank FacilityThree Months Ended September 30,Nine Months Ended September 30,
Millions2021202020212020
Beginning balance$276.6 $273.4 $277.4 $221.3 
Term loans
Borrowings (1)
 —  52.4 
Repayments(.7)(.7)(2.1)(1.3)
Foreign currency translation(1.5)2.3 (.9)2.6 
Revolving credit loan
Borrowings (2)
35.0 — 35.0 — 
Repayments(9.0)— (9.0)— 
Ending balance300.4 275.0 $300.4 $275.0 
(1) Borrowings for the nine months ended September 30, 2020 included $52.4 for the funding of the acquisition of Kingsbridge.
(2) Borrowings for both the three and nine months ended September 30, 2021 included $35.0 for the funding of the acquisition of J.C. Taylor.
Schedule of Debt
The following table presents the NSM weighted average interest rate for the nine months ended September 30, 2021 and 2020:

NSM Weighted Average Interest RateNine Months Ended September 30,
20212020
MillionsWeighted Average
Interest Expense (1)
Weighted Average Interest rateWeighted Average
Interest Expense (1)
Weighted Average Interest rate
Term loan - hedged$147.1 $10.0 9.1 %$148.5 $10.0 9.0 %
Term loan - unhedged129.57.37.5 %125.16.16.5 %
Total NSM Facility$276.6 $17.3 8.3 %$273.6 $16.1 7.8 %
(1) Interest expense includes the amortization of debt issuance costs and the effect of the interest rate swap and excludes interest expense related to the Other NSM Debt.