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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of debt outstanding
The following table presents White Mountains’s debt outstanding as of June 30, 2018 and December 31, 2017:
Millions
 
June 30,
2018
 
Effective
  Rate (1)
 
December 31,
2017
 
Effective
  Rate (1)
WTM Bank Facility
 
$
—

 
N/A
 
$
—

 
N/A
NSM Bank Facility
 
151.0

 
8.7%
 
—

 
 
Unamortized issuance cost
 
(3.5
)
 
 
 
—

 
 
NSM Bank Facility, carrying value
 
147.5

 
 
 
—

 
 
Other NSM debt
 
2.3

 
 
 
—

 
 
MediaAlpha Bank Facility
 
19.9

 
6.2%
 
23.9

 
5.6%
Unamortized issuance cost
 
(.1
)
 
 
 
(.1
)
 
 
MediaAlpha Bank Facility, carrying value
 
19.8

 
 
 
23.8

 
 
Total debt
 
$
169.6

 
 
 
$
23.8

 
 

 (1) Effective rate considers the effect of the debt issuance costs.