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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 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 WTM Bank Facility, which was undrawn at March 31, 2018 and December 31, 2017, and the MediaAlpha Bank Facility, which is 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 March 31, 2018 and December 31, 2017:
 
 
March 31, 2018
 
December 31, 2017
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
MediaAlpha Bank Facility
 
$
21.8

 
$
21.6

 
$
23.9

 
$
23.8



The fair value estimate for the MediaAlpha Bank Facility has been determined based on a discounted cash flows approach and is considered to be a Level 3 measurement.