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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operations: |  |
Net income (loss) | $ (218.6) | $ 22.0
Adjustments to reconcile net income to net cash provided from (used for) operations: |  |
Net realized and unrealized investment (gains) losses | 112.5 | (60.7)
Net realized and unrealized investment (gains) losses from investment in MediaAlpha | 94.7 | (71.3)
Deferred income tax expense | 4.0 | 28.5
Amortization of restricted share awards | 6.5 | 7.5
Amortization and depreciation | 8.4 | 8.2
Net (income) loss from NSM Group discontinued operation, net of tax | (10.1) | 29.1
Net (gain) loss from sale of Sirius Group, net of tax | 0.0 | (18.7)
Other operating items: |  |
Net change in reinsurance recoverables | 49.7 | 2.0
Net change in insurance premiums receivable | (478.8) | (352.3)
Net change in ceded unearned premiums | (38.3) | 54.1
Net change in loss and loss adjustment expense reserves | 127.4 | 64.0
Net change in unearned insurance premiums | 532.4 | 406.0
Net change in deferred acquisition costs | (85.0) | (81.5)
Net change in reinsurance payable | (5.3) | (15.5)
Net change in restricted cash | 2.8 | 4.0
Investments in Kudu Participation Contracts | (52.8) | (11.3)
Net change in other assets and liabilities, net | (46.3) | (42.6)
Net cash provided from (used for) operations - continuing operations | 3.2 | (28.5)
Net cash provided from (used for) operations - NSM Group discontinued operations (Note 19) | 36.7 | 42.4
Net cash provided from (used for) operations | 39.9 | 13.9
Cash flows from investing activities: |  |
Net change in short-term investments | 212.6 | (8.3)
Sales of fixed maturity investments | 153.4 | 127.2
Maturities, calls and paydowns of fixed maturity investments | 75.6 | 86.4
Sales of common equity securities and investment in MediaAlpha | 0.0 | 176.8
Distributions and redemptions of other long-term investments | 46.5 | 58.1
Proceeds from the sale of consolidated subsidiaries, net of cash sold of $0.0 and $0.0 | 19.5 | 0.0
Release of cash pre-funded/placed in escrow for Ark Transaction | 0.0 | 646.3
Purchases of consolidated subsidiaries, net of cash acquired of $0.3 and $52.2 | (67.9) | 10.6
Purchases of other long-term investments | (50.4) | (130.2)
Purchases of common equity securities | (38.1) | (103.7)
Purchases of fixed maturity investments | (330.8) | (764.3)
Other investing activities, net | 5.7 | (6.0)
Net cash provided from (used for) investing activities - continuing operations | 26.1 | 92.9
Net cash provided from (used for) investing activities - NSM Group discontinued operations (Note 19) | 7.1 | (2.6)
Net cash provided from (used for) investing activities | 33.2 | 90.3
Cash flows from financing activities: |  |
Draw down of debt and revolving line of credit | 203.0 | 105.3
Repayment of debt and revolving line of credit | (2.4) | (94.2)
Cash dividends paid to the Company’s common shareholders | (3.0) | (3.1)
Common shares repurchased | (101.6) | (7.4)
Net distributions from non-controlling interest shareholders | (6.5) | (1.1)
Contributions from discontinued operations | 11.6 | 0.0
Capital contributions from BAM members | 36.3 | 30.1
Acquisition of subsidiary shares by non-controlling interest shareholders | 74.6 | 6.1
Fidus Re premium payment | (3.8) | (5.0)
Other financing activities, net | (1.8) | (7.8)
Net cash provided from (used for) financing activities - continuing operations | 206.4 | 22.9
Net cash provided from (used for) financing activities - NSM Group discontinued operations (Note 19) | (16.9) | (11.2)
Net cash provided from (used for) financing activities | 189.5 | 11.7
Net change in cash during the period | 235.7 | 87.3
Cash balances at beginning of period (includes restricted cash balances of $4.5 and $— and excludes discontinued operations cash balances of $111.6 and $126.6) | 147.7 | 84.6
Cash balances at end of period (includes restricted cash balances of $7.3 and $4.0 and excludes discontinued operations cash balances of $142.7 and 154.8) | 383.4 | 171.9
Supplemental cash flows information: |  |
Interest paid | (6.3) | (3.4)
Net income tax payments | (3.8) | (2.1)
Marketing Technology (MediaAlpha) |  |
Adjustments to reconcile net income to net cash provided from (used for) operations: |  |
Net realized and unrealized investment (gains) losses from investment in MediaAlpha | $ 94.7 | $ (71.3)

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- Definition Proceeds From Release of Cash Placed in Escrow + References No definition available. + Details
Name: | wtm_ProceedsFromReleaseOfCashPlacedInEscrow
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash inflow associated with the sale of equity securities classified as trading. + References No definition available. + Details
Name: | wtm_ProceedsFromSaleOfTradingCommonEquitySecurities
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of fixed maturity and convertible fixed maturity investments classified as trading. + References No definition available. + Details
Name: | wtm_ProceedsFromSaleOfTradingFixedMaturityAndConvertibleFixedMaturityInvestments
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from Subsidiary Transaction Net of Cash Sold + References No definition available. + Details
Name: | wtm_ProceedsFromSubsidiaryTransactionNetOfCashSold
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wtm_MediaAlphaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |