CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Assets
Fixed maturity investments, at fair value		$ 2,081.1
Common equity securities, at fair value		0.0
Total investments	$ 3,380.7	2,714.4
Goodwill and intangible assets	62.1	45.2
Total assets	3,659.2	6,520.2
Liabilities
Debt	23.8	12.7
Liabilities held for sale		2,569.3
Total liabilities	298.4	2,804.2
White Mountains’s common shareholders’ equity
White Mountains’s common shares at $1 par value per share—authorized 50,000,000 shares; issued and outstanding 3,750,171 and 4,563,814 shares	3.8	4.6
Paid-in surplus	666.8	806.1
Retained earnings	2,823.2	2,776.6
Accumulated other comprehensive loss, after-tax:
Net unrealized foreign currency translation losses	(1.3)	(1.4)
Accumulated other comprehensive loss from net change in benefit plan assets and obligations	0.0	(3.2)
Total White Mountains’s common shareholders’ equity	3,492.5	3,582.7
Non-controlling interests
Non-controlling interests	(131.7)	133.3
Total equity	3,360.8	3,716.0
Total liabilities and equity	3,659.2	6,520.2
HG Global BAM
Assets
Fixed maturity investments, at fair value	623.6	585.2
Short-term investments, at amortized cost (which approximates fair value)	69.8	44.5
Total investments	693.4	629.7
Cash	25.6	27.0
Insurance premiums receivable	4.5	1.6
Deferred acquisition costs	14.8	10.6
Accrued investment income	3.4	2.9
Accounts receivable on unsettled investment sales	0.1	0.0
Other assets	5.6	5.8
Total assets	747.4	677.6
Liabilities
Unearned insurance premiums	136.8	82.9
Accrued incentive compensation	18.2	16.6
Accounts payable on unsettled investment purchases	0.6	0.0
Other liabilities	11.4	9.4
Total liabilities	167.0	108.9
MediaAlpha
Assets
Cash	9.1	1.7
Goodwill and intangible assets	53.7	36.6
Accounts receivable from publishers and advertisers	32.4	18.4
Other assets	1.3	0.9
Total assets	96.5	57.6
Liabilities
Debt	23.8	12.7
Amounts due to publishers and advertisers	31.6	13.0
Accrued incentive compensation	2.0	0.0
Other liabilities	2.4	2.6
Total liabilities	59.8	28.3
Other
Assets
Fixed maturity investments, at fair value	1,506.1	1,495.9
Short-term investments, at amortized cost (which approximates fair value)	106.3	130.4
Common equity securities, at fair value	866.1	285.6
Other long-term investments	208.8	172.8
Total investments	2,687.3	2,084.7
Cash	62.4	51.5
Accrued investment income	13.9	11.9
Accounts receivable on unsettled investment sales	20.9	4.8
Goodwill and intangible assets	8.4	8.6
Other assets	19.1	17.1
Assets held for sale	3.3	3,606.4
Total assets	2,815.3	5,785.0
Liabilities
Accrued incentive compensation	60.6	79.1
Other liabilities	11.0	18.6
Liabilities held for sale	0.0	2,569.3
Total liabilities	$ 71.6	$ 2,667.0