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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments The following table presents the fair value and carrying value of this financial instrument as of March 31, 2019 and December 31, 2018:
 
 
March 31, 2019
 
December 31, 2018
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
NSM Bank Facility
 
$
182.9

 
$
182.8

 
$
176.1

 
$
176.6

MediaAlpha Bank Facility
 
$
—

 
$
—

 
$
14.6

 
$
14.2

Other Operations debt
 
$
10.9

(1) 
$
10.9

 
$
—

 
$
—


(1) White Mountains measured the fair value of the Other Operations debt at the carrying value as a result of the debt being acquired on March 12, 2019.