XML 92 R81.htm IDEA: XBRL DOCUMENT
v3.20.2

Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019
Segment reporting information |  |  |  |  |
Net investment income | $ 19.6 | $ 21.0 |  | $ 42.5 | $ 37.0
Net realized and unrealized investment gains |  |  |  | (3.8) | 280.8
Total revenues | 259.6 | 129.0 |  | 200.4 | 562.6
Total expenses | 126.9 | 113.2 |  | 233.7 | 265.1
Pre-tax income (loss) | 132.7 | 15.8 |  | (33.3) | 297.5
Other Revenue | 179.4 | 61.0 |  | 50.9 | 395.2
Revenues from Contract with Customer and Products, Including Assessed Tax |  |  |  |  | 167.4
Revenue from Contract with Customer, Including Assessed Tax | 80.2 | 68.0 |  | 149.5 | 166.8
Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Earned insurance premiums |  | 0.0 |  |  |
Commission revenues |  | 0.0 |  |  |
Total revenues | 22.1 | 4.4 |  | 4.7 | 4.4
Insurance acquisition expenses |  | 0.0 |  |  |
Cost of sales |  | 0.0 |  |  |
Amortization |  | 0.0 |  |  |
Interest expense |  | 0.0 |  |  |
Total expenses |  | 2.2 |  |  |
Pre-tax income (loss) |  | 2.2 |  |  |
Other Revenue | 22.1 | 4.4 |  | 4.7 | 4.4
Revenues from Contract with Customer and Products, Including Assessed Tax |  |  |  |  | 0.0
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Total revenues | 135.3 | 36.9 |  | 11.0 | 350.5
Other Revenue | 131.2 | 35.0 |  | 2.6 | 347.3
Revenues from Contract with Customer and Products, Including Assessed Tax |  |  |  |  | 3.2
Revenue from Contract with Customer, Including Assessed Tax | 4.1 | 1.9 |  | 8.4 | 2.6
Kudu investments |  |  |  |  |
Segment reporting information |  |  |  |  |
Earned insurance premiums | 0.0 |  |  | 0.0 |
Net investment income | 5.6 | 4.0 |  | 12.9 | 4.0
Net realized and unrealized investment gains | 16.5 | 0.4 |  | (8.3) | 0.4
Commission revenues | 0.0 |  |  | 0.0 |
Other revenue | 0.0 | 0.0 |  | 0.1 | 0.0
Total revenues | 22.1 | 4.4 |  | 4.7 | 4.4
Insurance acquisition expenses | 0.0 |  |  | 0.0 |
Cost of sales | 0.0 |  |  | 0.0 |
Cost of sales | 0.0 |  |  | 0.0 |
General and administrative expenses | 2.8 | 2.2 |  | 5.3 | 2.2
Amortization | 0.1 | 0.0 |  | 0.2 | 0.0
Interest expense | 1.5 | 0.0 |  | 2.9 | 0.0
Total expenses | 4.4 | 2.2 |  | 8.4 | 2.2
Pre-tax income (loss) | 17.7 |  |  | (3.7) | 2.2
HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Earned insurance premiums | 5.6 | 4.3 |  | 11.0 | 8.5
Net investment income | 4.9 | 5.4 |  | 10.4 | 10.7
Net realized and unrealized investment gains | 14.4 | 11.5 |  | 20.5 | 23.3
Commission revenues | 0.0 | 0.0 |  | 0.0 |
Other revenue | 1.2 | 0.4 |  | 1.7 | 1.0
Total revenues | 26.1 | 21.6 |  | 43.6 | 43.5
Insurance acquisition expenses | 2.1 | 1.4 |  | 3.8 | 2.7
Cost of sales | 0.2 | 0.1 |  | 0.2 | 0.2
Cost of sales | 0.0 | 0.0 |  | 0.0 |
General and administrative expenses | 12.5 | 12.3 |  | 27.2 | 26.6
Amortization | 0.0 | 0.0 |  | 0.0 |
Interest expense | 0.0 |  |  | 0.0 |
Total expenses | 14.8 | 13.8 |  | 31.2 | 29.5
Pre-tax income (loss) | 11.3 | 7.8 |  | 12.4 | 14.0
Other Revenue | 26.1 | 21.6 |  | 43.6 | 43.5
Revenues from Contract with Customer and Products, Including Assessed Tax |  |  |  |  | 0.0
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Earned insurance premiums | 0.0 |  |  | 0.0 |
Net investment income | 0.0 |  |  | 0.0 |
Net realized and unrealized investment gains | 0.0 |  |  | 0.0 |
Commission revenues | 63.0 | 54.9 |  | 116.0 | 98.2
Other revenue | 13.1 | 11.2 |  | 25.1 | 17.2
Total revenues | 76.1 | 66.1 |  | 141.1 | 115.4
Insurance acquisition expenses | 0.0 |  |  |  |
Cost of sales | 0.0 |  |  | 0.0 |
Cost of sales | 0.0 |  |  | 0.0 |
General and administrative expenses | 48.5 | 32.8 |  | 88.1 | 58.1
Broker commission expenses | 21.0 | 18.1 |  | 39.3 | 33.6
Change in fair value of contingent consideration earnout liabilities | (1.7) | 6.3 |  | (2.3) | 7.6
Amortization | 6.3 | 4.1 |  | 11.1 | 9.1
Interest expense | 5.7 | 4.1 |  | 10.0 | 7.8
Total expenses | 79.8 | 65.4 |  | 146.2 | 116.2
Pre-tax income (loss) | (3.7) | 0.7 |  | (5.1) | (0.8)
Other Revenue | 0.0 | 0.0 |  | 0.0 | 0.0
Revenues from Contract with Customer and Products, Including Assessed Tax |  |  |  |  | 115.4
Revenue from Contract with Customer, Including Assessed Tax | 76.1 | 66.1 |  | 141.1 | 115.4
MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Commission revenues | 0.0 | 0.0 |  | 0.0 | 48.8
Total revenues | 0.0 | 0.0 |  | 0.0 | 48.8
Cost of sales | 0.0 | 0.0 |  | 0.0 | 40.6
General and administrative expenses | 0.0 | 0.0 |  | 0.0 | 12.5
Amortization | 0.0 | 0.0 |  | 0.0 | 1.6
Interest expense | 0.0 | 0.0 |  | 0.0 | 0.2
Total expenses | 0.0 | 0.0 |  | 0.0 | 54.9
Pre-tax income (loss) |  |  |  |  | (6.1)
Other Revenue |  |  |  |  | 0.0
Revenues from Contract with Customer and Products, Including Assessed Tax |  |  |  |  | 48.8
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 48.8
Other Segment |  |  |  |  |
Segment reporting information |  |  |  |  |
Earned insurance premiums | 0.0 | 0.0 |  | 0.0 |
Net investment income | 9.1 | 11.6 |  | 19.2 | 22.3
Net realized and unrealized investment gains | 122.0 | 23.3 |  | (16.0) | 142.4
Realized gain and unrealized investment gain from the MediaAlpha Transaction |  | 0.0 |  | 0.0 | 182.2
Commission revenues | 1.9 | 1.3 |  | 4.0 | 2.6
Other revenue | 2.3 | 0.7 |  | 3.8 | 1.0
Total revenues | 135.3 | 36.9 |  | 11.0 | 350.5
Insurance acquisition expenses | 0.0 | 0.0 |  | 0.0 |
Cost of sales | 0.0 |  |  | 0.0 |
Cost of sales | 2.2 | 1.6 |  | 4.2 | 2.7
General and administrative expenses | 25.3 | 30.1 |  | 42.8 | 59.5
Amortization | 0.2 | 0.1 |  | 0.4 | 0.1
Interest expense | 0.2 | 0.0 |  | 0.5 | 0.0
Total expenses | 27.9 | 31.8 |  | 47.9 | 62.3
Pre-tax income (loss) | 107.4 | 5.1 |  | (36.9) | 288.2
Total |  |  |  |  |
Segment reporting information |  |  |  |  |
Earned insurance premiums | 5.6 | 4.3 |  | 11.0 | 8.5
Net investment income | 19.6 | 21.0 |  | 42.5 | 37.0
Net realized and unrealized investment gains | 152.9 | 35.2 |  | (3.8) | 166.1
Realized gain and unrealized investment gain from the MediaAlpha Transaction |  |  |  |  | 182.2
Commission revenues | 64.9 | 56.2 |  | 120.0 | 149.6
Other revenue | 16.6 | 12.3 |  | 30.7 | 19.2
Total revenues | 259.6 | 129.0 |  | 200.4 | 562.6
Insurance acquisition expenses | 2.1 | 1.4 |  | 3.8 | 2.7
Cost of sales | 0.2 | 0.1 |  | 0.2 | 0.2
Cost of sales | 2.2 | 1.6 |  | 4.2 | 43.3
General and administrative expenses | 89.1 | 77.4 |  | 163.4 | 158.9
Broker commission expenses | 21.0 | 18.1 |  | 39.3 | 33.6
Change in fair value of contingent consideration earnout liabilities | (1.7) | 6.3 |  | (2.3) | 7.6
Amortization | 6.6 | 4.2 |  | 11.7 | 10.8
Interest expense | 7.4 | 4.1 |  | 13.4 | 8.0
Total expenses | 126.9 | 113.2 |  | 233.7 | 265.1
Pre-tax income (loss) | 132.7 | 15.8 |  | (33.3) | 297.5
NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Change in fair value of contingent consideration earnout liabilities | (1.7) | 6.3 | $ 2.6 | 2.3 | 7.6
Commission and Other Revenue [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 77.9 | 67.4 |  | 145.1 | 118.0
Commission and Other Revenue [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Commission and Other Revenue [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1.8 | 1.3 |  | 4.0 | 2.6
Commission and Other Revenue [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Commission and Other Revenue [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 76.1 | 66.1 |  | 141.1 | 115.4
Commission and Other Revenue [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Real Estate [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 15.4 | 11.5 |  | 26.7 | 20.5
Real Estate [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Real Estate [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Real Estate [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Real Estate [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 15.4 | 11.5 |  | 26.7 | 20.5
Real Estate [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Social Services [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 7.3 | 6.5 |  | 13.6 | 12.3
Social Services [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Social Services [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Social Services [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Social Services [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 7.3 | 6.5 |  | 13.6 | 12.3
Social Services [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Other |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 5.8 | 6.0 |  | 13.1 | 11.8
Other | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Other | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1.8 | 1.3 |  | 4.0 | 2.6
Other | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Other | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4.0 | 4.7 |  | 9.1 | 9.2
Other | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Product [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.6 |  | 4.4 | 0.6
Product [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Product [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2.3 | 0.6 |  | 4.4 | 0.6
Product [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Product [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Product [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Pet [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 13.2 | 9.5 |  | 25.1 | 9.5
Pet [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Pet [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Pet [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Pet [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 13.2 | 9.5 |  | 25.1 | 9.5
Pet [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Advertising [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 48.8
Advertising [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Advertising [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Advertising [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Advertising [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
Advertising [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 48.8
Specialty Transportation [Member] |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 23.8 | 21.7 |  | 44.2 | 39.6
Specialty Transportation [Member] | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Specialty Transportation [Member] | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Specialty Transportation [Member] | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
Specialty Transportation [Member] | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 23.8 | 21.7 |  | 44.2 | 39.6
Specialty Transportation [Member] | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | 0.0
UNITED KINGDOM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 12.4 | 12.2 |  | 22.4 | 24.3
UNITED KINGDOM | Kudu |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
UNITED KINGDOM | Other Operations |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
UNITED KINGDOM | HG Global-BAM |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0.0 | 0.0 |  | 0.0 | 0.0
UNITED KINGDOM | NSM Holding Co LLC |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 12.4 | $ 12.2 |  | $ 22.4 | 24.3
UNITED KINGDOM | MediaAlpha |  |  |  |  |
Segment reporting information |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  | $ 0.0

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
Name: | us-gaap_BenefitsLossesAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of amortization expense (reversal of expense) for deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117418976&loc=d3e11522-158419 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=117419843&loc=SL117420844-207641 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 2B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117419109&loc=SL117422543-158416 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
Name: | us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_InterestExpenseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
Name: | us-gaap_NetInvestmentIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue and income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
Name: | us-gaap_OtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 720 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35755714&loc=d3e28434-158551 + Details
Name: | us-gaap_OtherUnderwritingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_PremiumsEarnedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Broker Commission Expense + References No definition available. + Details
Name: | wtm_BrokerCommissionExpense
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commission Revenue + References No definition available. + Details
Name: | wtm_CommissionRevenue
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other Revenue + References No definition available. + Details
Name: | wtm_OtherRevenue
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Realized and Unrealized Gains from Transaction + References No definition available. + Details
Name: | wtm_RealizedandUnrealizedGainsfromTransaction
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenues from Contract with Customer and Products, Including Assessed Tax + References No definition available. + Details
Name: | wtm_RevenuesfromContractwithCustomerandProductsIncludingAssessedTax
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_KuduMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_OtherOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_KuduInvestmentManagementLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_HgGlobalBamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_NSMInsuranceGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_MediaAlphaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_OtherEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wtm_TotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wtm_NSMInsuranceGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wtm_CommissionandOtherRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wtm_SocialServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wtm_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wtm_PetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_AdvertisingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wtm_SpecialtyTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |