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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments The following table presents the fair value and carrying value of this financial instrument as of March 31, 2021 and December 31, 2020:
 March 31, 2021December 31, 2020
MillionsFair
Value		Carrying
Value		Fair
Value		Carrying
Value
Ark Subordinated Notes (1)
$44.1 $44.1 $— $— 
NSM Bank Facility$275.6 $271.5 $279.3 $271.3 
Other NSM debt$1.3 $1.2 $1.3 $1.3 
Kudu Credit Facility (2)
$102.0 $95.9 $— $— 
Kudu Bank Facility$— $— $89.3 $86.3 
Other Operations debt$18.3 $17.0 $18.8 $17.5 
(1) As of March 31, 2021, White Mountains measured the fair value of the Ark Bank Facility Notes at the carrying value as a result of the debt being acquired on January 1, 2021. See Note 7 — “Debt”.
(2) As of March 31, 2021, White Mountains measured the fair value of the Kudu Credit Facility debt at the carrying value, before unamortized issuance costs, as a result of the debt being refinanced on March 23, 2021.