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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
 
White Mountains accounts for all its financial instruments at fair value with the exception of the NSM Bank Facility and the MediaAlpha Bank Facility, which are recorded as debt at face value less unamortized original issue discount.
The following table presents the fair value and carrying value of this financial instrument as of September 30, 2018 and December 31, 2017:
 
 
September 30, 2018
 
December 31, 2017
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
NSM Bank Facility
 
$
147.3

 
$
147.3

 
$

 
$

MediaAlpha Bank Facility
 
$
15.3

 
$
15.0

 
$
23.9

 
$
23.8



The fair value estimates for the MediaAlpha Bank Facility and the NSM Bank Facility have been determined based on a discounted cash flows approach and are considered to be Level 3 measurements.