Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of debt outstanding

The following table presents White Mountains’s debt outstanding as of December 31, 2017 and 2016:

	December 31,			Effective	December 31,			Effective
Millions	2017			Rate (1)	2016			Rate (1)
WTM Bank Facility	$	—		N/A	$	—		N/A
Unamortized issue costs	—				—
WTM Bank Facility, carrying value	—				—
MediaAlpha Bank Facility	23.9			5.6%	—			N/A
Unamortized issuance cost	(.1		)		—
MediaAlpha Bank Facility, carrying value	23.8				—
Previous MediaAlpha Bank Facility	—			N/A	12.9			5.7%
Unamortized issuance cost	—				(.2		)
Previous MediaAlpha Bank Facility, carrying value	—				12.7
Total debt	$	23.8			$	12.7

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

Schedule of contractual repayments of debt

The following table presents a schedule of contractual repayments of White Mountains’s debt as of December 31, 2017:

Millions	December 31, 2017
Due in one year or less	$	3.1
Due in two to three years	12.1
Due in four to five years	8.7
Due after five years	—
Total	$	23.9