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Segment Information (Tables)

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Schedule of Financial Information for White Mountains' Segments

The following tables present the financial information for White Mountains’s segments for the three months ended March 31, 2023 and 2022:

Millions						HG Global/BAM												Ark/WM Outrigger
						HG Global						BAM (1)						Ark						WM Outrigger Re												Kudu												Other Operations						Total
Three Months Ended March 31, 2023
Earned insurance premiums						$	6.4					$	1.3					$	249.9					$	5.2											$	—											$	—					$	262.8
Net investment income						4.0						3.2						8.4						2.2												14.2												7.0						39.0
Net investment income (expense) -   BAM Surplus Note interest						6.6						(6.6)						—						—												—												—						—
Net realized and unrealized investment    gains (losses)						7.9						9.1						24.5						—												29.6												41.8						112.9
Net realized and unrealized investment gains    (losses) from investment in MediaAlpha						—						—						—						—												—												85.2						85.2
Commission revenues						—						—						—						—												—												3.3						3.3
Other revenues						—						.8						(2.7)						—												—												30.6						28.7
Total revenues						24.9						7.8						280.1						7.4												43.8												167.9						531.9
Loss and loss adjustment expenses						—						—						147.6						.2												—												—						147.8
Acquisition expenses						1.8						.9						58.9						.9												—												—						62.5
Cost of sales						—						—						—						—												—												13.9						13.9
General and administrative expenses						1.1						16.2						35.1						.1												3.8												39.7						96.0
Change in fair value of contingent    consideration						—						—						(2.4)						—												—												—						(2.4)
Interest expense						4.5						—						5.0						—												4.7												.8						15.0
Total expenses						7.4						17.1						244.2						1.2												8.5												54.4						332.8
Pre-tax income (loss) from continuing operations						$	17.5					$	(9.3)					$	35.9					$	6.2											$	35.3											$	113.5					$	199.1

(1) BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS.

Millions						HG Global/BAM												Ark/WM Outrigger																								Other Operations
						HG Global						BAM (1)						Ark															Kudu																		Total
Three Months Ended March 31, 2022
Earned insurance premiums						$	6.9					$	1.5					$	194.4														$	—											$	—					$	202.8
Net investment income						2.1						2.5						1.6															12.6												1.8						20.6
Net investment income (expense) -    BAM Surplus Note interest						2.9						(2.9)						—															—												—						—
Net realized and unrealized investment gains (losses)						(23.5)						(21.6)						(17.5)															22.3												31.9						(8.4)
Net realized and unrealized investment gains    (losses) from investment in MediaAlpha						—						—						—															—												18.8						18.8
Commission revenues						—						—						—															—												2.9						2.9
Other revenues						.1						.7						(2.8)															—												25.7						23.7
Total revenues						(11.5)						(19.8)						175.7															34.9												81.1						260.4
Losses and loss adjustment expenses						—						—						122.0															—												—						122.0
Acquisition expenses						2.6						.4						49.9															—												—						52.9
Cost of sales						—						—						—															—												21.4						21.4
General and administrative expenses						.7						15.6						21.0															2.8												29.8						69.9
Change in fair value of contingent consideration						—						—						2.1															—												—						2.1
Interest expense						—						—						3.8															2.8												.3						6.9
Total expenses						3.3						16.0						198.8															5.6												51.5						275.2
Pre-tax income (loss) from continuing operations						$	(14.8)					$	(35.8)					$	(23.1)														$	29.3											$	29.6					$	(14.8)

(1) BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS.

Schedule of Reconciliation of Revenue from Segments to Consolidated

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- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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