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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
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 September 30, 2020 and December 31, 2019:
 
 
September 30, 2020
 
December 31, 2019
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
NSM Bank Facility
 
$
276.1

 
$
268.8

 
$
221.2

 
$
217.4

Other NSM debt
 
$
1.6

 
$
1.4

 
$
1.7

 
$
1.8

Kudu Bank Facility
 
$
74.4

 
$
71.0

 
$
53.6

(1) 
$
53.6

Other Operations debt
 
$
18.5

 
$
18.2

 
$
11.3

 
$
10.7


(1) 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”.