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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of the fair value and carrying value of financial instruments The following tables presents the fair value and carrying value of these financial instruments as of December 31, 2020 and 2019:
December 31, 2020December 31, 2019
MillionsFair ValueCarrying ValueFair ValueCarrying Value
NSM Bank Facility$279.3 $271.3 $221.2 $217.4 
Other NSM debt$1.3 $1.3 $1.7 $1.8 
Kudu Bank Facility (1)
$89.3 $86.3 $53.6 $53.6 
Other Operations debt$18.8 $17.5 $11.3 $10.7 
(1) As of December 31, 2019, White Mountains measured the fair value of the Kudu Bank Facility debt at the carrying value as a result of the debt being acquired on December 23, 2019. See Note 5 — “Debt”.