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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
 
White Mountains carries its financial instruments on its balance sheet at fair value with the exception of its fixed-rate, long-term indebtedness and the SIG Preference Shares, which are recorded as noncontrolling interest. 
The following table summarizes the fair value and carrying value of financial instruments as of September 30, 2012 and December 31, 2011:
 
 
 
September 30, 2012
 
December 31, 2011
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
OBH Senior Notes
 
$
276.3

 
$
269.8

 
$
277.4

 
$
269.8

SIG Senior Notes
 
442.9

 
399.4

 
418.6

 
399.3

SIG Preference Shares
 
257.5

 
250.0

 
217.5

 
250.0

 
The fair value estimate for the OBH Senior Notes has been determined using observable inputs for similar instruments and is considered a Level 2 measurement. 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.