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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
 
White Mountains accounts for its financial instruments at fair value with the exception of the OBH Senior Notes and the SIG Senior Notes, which are recorded as debt liabilities at face value less unamortized original issue discount, and the SIG Preference Shares, which are recorded as non-controlling interest at face value.
The following table summarizes the fair value and book value of financial instruments as of June 30, 2014 and December 31, 2013:
 
 
June 30, 2014
 
December 31, 2013
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
2012 OBH Senior Notes
 
$
283.9

 
$
274.7

 
$
269.8

 
$
274.7

SIG Senior Notes
 
438.2

 
399.6

 
438.1

 
399.6

SIG Preference Shares
 
262.5

 
250.0

 
260.0

 
250.0



The fair value estimate for the 2012 OBH Senior Notes has been determined using quoted market prices. The 2012 OBH Senior Notes are considered a Level 2 measurement based upon the volume and frequency of observable transactions. The fair value estimates for the SIG Senior Notes and the SIG Preference Shares have been determined based on indicative broker quotes and are considered to be Level 3 measurements.