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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments
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