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Segment Information (Tables)
9 Months Ended
Sep. 30, 2022
Segment Reporting [Abstract]  
Schedule of Financial Information for White Mountains' Segments
The following tables present the financial information for White Mountains’s segments:
MillionsHG Global/ BAMArk
Kudu
Other OperationsTotal
Three Months Ended September 30, 2022
Earned insurance premiums$7.1 $346.1 $— $— $353.2 
Net investment income5.7 4.9 14.8 8.5 33.9 
Net realized and unrealized investment
   gains (losses)
(38.8)(14.4)41.1 (17.3)(29.4)
Net realized and unrealized investment gains
   (losses) from investment in MediaAlpha
— — — (18.6)(18.6)
Commission revenues — — — 3.2 3.2 
Other revenues1.3 6.6 — 33.0 40.9 
     Total revenues(24.7)343.2 55.9 8.8 383.2 
Loss and loss adjustment expenses— 213.7 — — 213.7 
Insurance and reinsurance acquisition expenses1.7 74.8 — — 76.5 
Cost of sales— — — 25.0 25.0 
General and administrative expenses15.8 26.9 4.5 39.9 87.1 
Amortization of other intangible assets— — — 1.4 1.4 
Interest expense2.0 3.7 4.2 .6 10.5 
     Total expenses19.5 319.1 8.7 66.9 414.2 
Pre-tax income (loss) from continuing operations$(44.2)$24.1 $47.2 $(58.1)$(31.0)

MillionsHG Global/ BAMArkKuduOther OperationsTotal
Three Months Ended September 30, 2021
Earned insurance premiums$6.7 $213.4 $— $— $220.1 
Net investment income4.4 .6 9.5 5.0 19.5 
Net realized and unrealized investment
   gains (losses)
(4.0).3 18.9 15.3 30.5 
Net realized and unrealized investment gains
   (losses) from investment in MediaAlpha
— — — (396.8)(396.8)
Commission revenues— — — 2.4 2.4 
Other revenues.3 3.4 .1 28.1 31.9 
     Total revenues7.4 217.7 28.5 (346.0)(92.4)
Losses and loss adjustment expenses— 129.2 — — 129.2 
Insurance and reinsurance acquisition expenses3.0 53.7 — — 56.7 
Cost of sales— — — 24.0 24.0 
General and administrative expenses12.4 21.8 3.3 14.4 51.9 
Amortization of other intangible assets— — — 2.0 2.0 
Interest expense— 2.1 1.9 .4 4.4 
     Total expenses15.4 206.8 5.2 40.8 268.2 
Pre-tax income (loss) from continuing operations$(8.0)$10.9 $23.3 $(386.8)$(360.6)
MillionsHG Global/ BAMArk
Kudu
Other OperationsTotal
Nine Months Ended September 30, 2022
Earned insurance premiums$26.0 $757.8 $— $— $783.8 
Net investment income15.1 9.7 41.2 13.6 79.6 
Net realized and unrealized investment
   gains (losses)
(114.0)(76.5)45.8 2.8 (141.9)
Net realized and unrealized investment gains
   (losses) from investment in MediaAlpha
— — — (113.3)(113.3)
Commission revenues — — — 8.7 8.7 
Other revenues3.7 10.1 — 89.6 103.4 
     Total revenues(69.2)701.1 87.0 1.4 720.3 
Loss and loss adjustment expenses— 456.2 — — 456.2 
Insurance and reinsurance acquisition expenses9.5 174.9 — — 184.4 
Cost of sales— — — 68.8 68.8 
General and administrative expenses49.5 79.8 10.2 118.9 258.4 
Amortization of other intangible assets— — .2 3.2 3.4 
Interest expense5.4 10.6 10.3 1.2 27.5 
     Total expenses64.4 721.5 20.7 192.1 998.7 
Pre-tax income (loss) from continuing operations$(133.6)$(20.4)$66.3 $(190.7)$(278.4)

MillionsHG Global/ BAMArk
Kudu
Other OperationsTotal
Nine Months Ended September 30, 2021
Earned insurance premiums$19.6 $435.8 $— $— $455.4 
Net investment income13.2 1.8 26.1 16.1 57.2 
Net realized and unrealized investment
   gains (losses)
(15.6)10.3 62.5 34.0 91.2 
Net realized and unrealized investment gains
   (losses) from investment in MediaAlpha
— — — (325.5)(325.5)
Commission revenues— — — 7.0 7.0 
Other revenues.9 9.4 .2 57.6 68.1 
     Total revenues18.1 457.3 88.8 (210.8)353.4 
Losses and loss adjustment expenses— 247.8 — — 247.8 
Insurance and reinsurance acquisition expenses6.5 124.4 — — 130.9 
Cost of sales— — — 45.9 45.9 
General and administrative expenses42.7 84.4 9.0 79.4 215.5 
Amortization of other intangible assets— — .2 2.9 3.1 
Interest expense— 4.5 9.2 1.1 14.8 
     Total expenses49.2 461.1 18.4 129.3 658.0 
Pre-tax income (loss) from continuing operations$(31.1)$(3.8)$70.4 $(340.1)$(304.6)
Schedule of Reconciliation of Revenue from Segments to Consolidated