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Variable Annuity Reinsurance (Details)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2012

USD ($)

Jun. 30, 2011

USD ($)

Jun. 30, 2012

USD ($)

Jun. 30, 2011

USD ($)

Jun. 30, 2012

JPY (¥)

Dec. 31, 2011

USD ($)

Dec. 31, 2011

JPY (¥)

Jun. 30, 2012

Fixed income/Interest rate

USD ($)

Jun. 30, 2011

Fixed income/Interest rate

USD ($)

Jun. 30, 2012

Fixed income/Interest rate

USD ($)

Jun. 30, 2011

Fixed income/Interest rate

USD ($)

Jun. 30, 2012

Foreign exchange

USD ($)

Jun. 30, 2011

Foreign exchange

USD ($)

Jun. 30, 2012

Foreign exchange

USD ($)

Jun. 30, 2011

Foreign exchange

USD ($)

Jun. 30, 2012

Equity

USD ($)

Jun. 30, 2011

Equity

USD ($)

Jun. 30, 2012

Equity

USD ($)

Jun. 30, 2011

Equity

USD ($)

Jun. 30, 2012

Level 1 Inputs

USD ($)

Jun. 30, 2011

Level 1 Inputs

USD ($)

Jun. 30, 2012

Level 1 Inputs

USD ($)

Jun. 30, 2011

Level 1 Inputs

USD ($)

Jun. 30, 2012

Level 2 Inputs

USD ($)

Jun. 30, 2011

Level 2 Inputs

USD ($)

Jun. 30, 2012

Level 2 Inputs

USD ($)

Jun. 30, 2011

Level 2 Inputs

USD ($)

Jun. 30, 2012

Level 3 Inputs

USD ($)

Jun. 30, 2011

Level 3 Inputs

USD ($)

Jun. 30, 2012

Level 3 Inputs

USD ($)

Jun. 30, 2011

Level 3 Inputs

USD ($)

Jun. 30, 2012

Fair Value

USD ($)

Jun. 30, 2011

Fair Value

USD ($)

Jun. 30, 2012

Fair Value

USD ($)

Jun. 30, 2011

Fair Value

USD ($)

Jun. 30, 2012

WM Life Re

USD ($)

Rating

Jun. 30, 2011

WM Life Re

USD ($)

Jun. 30, 2012

WM Life Re

USD ($)

Rating

Jun. 30, 2011

WM Life Re

USD ($)

Dec. 31, 2011

WM Life Re

USD ($)

Jun. 30, 2012

WM Life Re

Citigroup

USD ($)

Jun. 30, 2012

WM Life Re

Royal Bank of Scotland

USD ($)

Jun. 30, 2012

WM Life Re

Bank of America

USD ($)

Jun. 30, 2012

WM Life Re

JP Morgan

USD ($)

Jun. 30, 2012

WM Life Re

Nomura

USD ($)

Jun. 30, 2012

WM Life Re

Barclays

USD ($)

Jun. 30, 2012

WM Life Re

Goldman Sachs

USD ($)

Jun. 30, 2012

WM Life Re

Cash

USD ($)

Dec. 31, 2011

WM Life Re

Cash

USD ($)

Jun. 30, 2012

WM Life Re

Fixed maturity investments.

USD ($)

Dec. 31, 2011

WM Life Re

Fixed maturity investments.

USD ($)

Jun. 30, 2012

WM Life Re

Short-term investments

USD ($)

Dec. 31, 2011

WM Life Re

Short-term investments

USD ($)

Variable annuity reinsurance

Total guarantee value

$ 2,900,000,000

$ 2,900,000,000

¥ 231,400,000,000

$ 3,000,000,000

¥ 233,700,000,000

Collective account values of underlying variable annuities as a percentage of the guarantee value

79.00%

79.00%

78.00%

78.00%

Pre-tax operating results of WM Life Re

Fees, included in other revenues

8,000,000

8,000,000

16,000,000

15,900,000

Change in fair value of variable annuity liability, included in other revenues

(110,500,000)

(35,900,000)

100,800,000

16,400,000

Change in fair value of derivatives, included in other revenues

95,500,000

22,000,000

(111,000,000)

(43,500,000)

28,600,000

(6,300,000)

(50,500,000)

(12,500,000)

27,400,000

17,100,000

(27,500,000)

(30,200,000)

39,500,000

11,200,000

(33,000,000)

(800,000)

24,300,000

2,800,000

^[1]

(23,700,000)

(16,800,000)

^[1]

41,700,000

^[2]

12,500,000

^[2],[3]

(56,500,000)

^[2]

(8,200,000)

^[2],[3]

29,500,000

^[2]

6,700,000

^[2]

(30,800,000)

^[2]

(18,500,000)

^[2]

95,500,000

22,000,000

^[4]

(111,000,000)

(43,500,000)

^[4]

95,500,000

22,000,000

(111,000,000)

(43,500,000)

Foreign exchange, included in other revenues

7,600,000

6,900,000

(15,400,000)

2,300,000

Other investment income and gain (loss)

1,200,000

(200,000)

(900,000)

(600,000)

Total revenues

544,000,000

553,600,000

1,174,600,000

1,083,200,000

1,800,000

800,000

(10,500,000)

(9,500,000)

Change in fair value of variable annuity death benefit liabilities, included in other expenses

(2,800,000)

(500,000)

5,900,000

2,500,000

Death benefit claims paid, included in other expenses

(1,700,000)

(700,000)

(3,400,000)

(1,700,000)

General and administrative expenses

(42,100,000)

(56,200,000)

(87,600,000)

(84,200,000)

(1,300,000)

(1,400,000)

(2,700,000)

(2,100,000)

Pre-tax loss

38,300,000

36,100,000

166,600,000

2,400,000

(4,000,000)

(1,800,000)

(10,700,000)

(10,800,000)

Changes in variable annuity liabilities

Balance of liabilities at the beginning of the period

(548,500,000)

(554,900,000)

(768,500,000)

(610,200,000)

Purchases

0

0

0

0

Realized and unrealized gains (losses)

(113,300,000)

(36,400,000)

106,700,000

18,900,000

Sales/settlements

0

0

0

0

Balance of liabilities at the end of the period

(661,800,000)

(591,300,000)

(661,800,000)

(591,300,000)

Changes in derivative instruments

Balance of assets at the beginning of the period

290,400,000

31,100,000

161,300,000

98,000,000

(9,400,000)

7,300,000

^[1]

4,100,000

0

^[1]

(100,000)

^[2]

54,800,000

^[2],[3]

39,200,000

^[2]

72,200,000

^[2],[3]

183,800,000

^[2]

226,000,000

^[2]

247,100,000

^[2]

275,300,000

^[2]

174,300,000

288,100,000

^[4]

290,400,000

347,500,000

^[4]

Purchases

0

0

^[1]

0

0

^[1]

0

^[2]

0

^[2],[3]

0

^[2]

0

^[2],[3]

0

^[2]

0

^[2]

6,100,000

^[2]

5,000,000

^[2]

0

0

^[4]

6,100,000

5,000,000

^[4]

Realized and unrealized gains (losses)

95,500,000

22,000,000

(111,000,000)

(43,500,000)

28,600,000

(6,300,000)

(50,500,000)

(12,500,000)

27,400,000

17,100,000

(27,500,000)

(30,200,000)

39,500,000

11,200,000

(33,000,000)

(800,000)

24,300,000

2,800,000

^[1]

(23,700,000)

(16,800,000)

^[1]

41,700,000

^[2]

12,500,000

^[2],[3]

(56,500,000)

^[2]

(8,200,000)

^[2],[3]

29,500,000

^[2]

6,700,000

^[2]

(30,800,000)

^[2]

(18,500,000)

^[2]

95,500,000

22,000,000

^[4]

(111,000,000)

(43,500,000)

^[4]

95,500,000

22,000,000

(111,000,000)

(43,500,000)

Sales/settlements

(38,600,000)

(22,000,000)

^[1]

(4,100,000)

4,900,000

^[1]

19,400,000

^[2]

(19,100,000)

^[2],[3]

78,300,000

^[2]

(15,800,000)

^[2],[3]

(300,000)

^[2]

0

^[2]

(9,400,000)

^[2]

(29,100,000)

^[2]

(19,500,000)

(41,100,000)

^[4]

64,800,000

(40,000,000)

^[4]

Balance of assets at the end of the period

250,300,000

250,300,000

64,800,000

64,800,000

127,700,000

127,700,000

57,800,000

57,800,000

(23,700,000)

(11,900,000)

^[1]

(23,700,000)

(11,900,000)

^[1]

61,000,000

^[2]

48,200,000

^[2],[3]

61,000,000

^[2]

48,200,000

^[2],[3]

213,000,000

^[2]

232,700,000

^[2]

213,000,000

^[2]

232,700,000

^[2]

250,300,000

269,000,000

^[4]

250,300,000

269,000,000

^[4]

Realized and unrealized derivative gains (losses) recognized in other revenues and carrying values of instruments

Realized and unrealized derivative gains (losses) recognized in other revenues

95,500,000

22,000,000

(111,000,000)

(43,500,000)

28,600,000

(6,300,000)

(50,500,000)

(12,500,000)

27,400,000

17,100,000

(27,500,000)

(30,200,000)

39,500,000

11,200,000

(33,000,000)

(800,000)

24,300,000

2,800,000

^[1]

(23,700,000)

(16,800,000)

^[1]

41,700,000

^[2]

12,500,000

^[2],[3]

(56,500,000)

^[2]

(8,200,000)

^[2],[3]

29,500,000

^[2]

6,700,000

^[2]

(30,800,000)

^[2]

(18,500,000)

^[2]

95,500,000

22,000,000

^[4]

(111,000,000)

(43,500,000)

^[4]

95,500,000

22,000,000

(111,000,000)

(43,500,000)

Carrying value

250,300,000

250,300,000

64,800,000

64,800,000

127,700,000

127,700,000

57,800,000

57,800,000

(23,700,000)

(11,900,000)

^[1]

(23,700,000)

(11,900,000)

^[1]

61,000,000

^[2]

48,200,000

^[2],[3]

61,000,000

^[2]

48,200,000

^[2],[3]

213,000,000

^[2]

232,700,000

^[2]

213,000,000

^[2]

232,700,000

^[2]

250,300,000

269,000,000

^[4]

250,300,000

269,000,000

^[4]

Credit risk on derivative instruments

OTC derivative instruments

282,200,000

^[5]

282,200,000

^[5]

295,400,000

^[5]

Collateral held

(86,900,000)

(86,900,000)

(73,200,000)

(360,000,000)

(453,500,000)

(91,000,000)

(31,200,000)

(20,600,000)

(600,000)

Collateral provided

62,600,000

62,600,000

83,000,000

0

0

86,900,000

73,200,000

Cash and short-term investments held and posted as collateral to its reinsurance counterparties

471,600,000

370,500,000

471,600,000

370,500,000

485,300,000

Net exposure to credit losses on fair value of OTC instruments

257,900,000

257,900,000

305,200,000

55,600,000

^[6]

67,400,000

52,900,000

27,800,000

^[6]

30,500,000

^[6]

20,600,000

3,100,000

^[6]

Number of creditworthiness ratings

21

21

Adjustments for counterparty credit risk

$ (8,200,000)

$ (8,200,000)

$ (9,100,000)

[1]	(3) Consists of exchange traded equity index, foreign currency and interest rate futures. Fair value measurements based upon quoted prices for identical instruments that are actively traded.
[2]	(1) Consists of over-the-counter instruments.
[3]	(2) Consists of interest rate swaps, total return swaps, foreign currency forward contracts, and bond forwards. Fair value measurement based upon bid/ask pricing quotes for similar instruments that are actively traded, where available. Swaps for which an active market does not exist have been priced using observable inputs including the swap curve and the underlying bond index.
[4]	(4) In addition to derivative instruments, WM Life Re held cash, short-term and fixed maturity investments of $471.6 and $370.5 at June 30, 2012 and 2011 posted as collateral to its reinsurance counterparties.
[5]	(1) Value of OTC derivative instruments as of June 30, 2012 and December 31, 2011 excludes adjustments for counterparty credit risk of $(8.2) and $(9.1) included in fair value under GAAP.The f
[6]	(2) Collateral provided (held) calculated under master netting agreement.

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives.

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-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Monetary decrease in the future benefit reserve resulting from amounts paid to policy and contract holders during the period for policy benefit claims.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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An amount that an insurer adds to a policy's premium, or deducts from a policy's cash value or contract holder's account, as compensation for services rendered; may include fees.

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- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents cash and short-term investments held and posted as collateral to reinsurance counterparties.

+ References

No definition available.

+ Details

Name:	wtm_CollateralCashAndInvestments
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the collective account values of underlying variable annuities as a percentage of the guarantee value of the associated variable annuity reinsurance liability.

+ References

No definition available.

+ Details

Name:	wtm_CollectiveAccountValueAsPercentageOfGuaranteedValue
Namespace Prefix:	wtm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of collateral that has been posted against amounts owed by counterparties to over the counter derivative instruments against net derivative instrument positions.

+ References

No definition available.

+ Details

Name:	wtm_DerivativeCollateralObligationToReturn
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of collateral held against amounts due to counterparties for over the counter derivative instruments against net derivative instrument positions.

+ References

No definition available.

+ Details

Name:	wtm_DerivativeCollateralRightToReclaim
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount by which fair value of over the counter derivatives has been adjusted for counter party credit risk.

+ References

No definition available.

+ Details

Name:	wtm_DerivativeCounterpartyCreditRisk
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	wtm_DerivativeInstrumentsGainLossRecognizedInIncomeNetAndCarryingValueAbstract
Namespace Prefix:	wtm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	wtm_DerivativeInstrumentsRollForward
Namespace Prefix:	wtm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Purchases that have taken place during the period in relation to derivative assets measured at fair value on a recurring basis.

+ References

No definition available.

+ Details

Name:	wtm_FairValueDerivativesMeasuredOnRecurringBasisAssetPurchases
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sales and settlements that have taken place during the period in relation to derivative assets measured at fair value on a recurring basis.

+ References

No definition available.

+ Details

Name:	wtm_FairValueDerivativesMeasuredOnRecurringBasisAssetSalesAndSettlements
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sales or settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	wtm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySalesOrSettlements
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This item represents the change in fair value of derivatives due to changes in foreign currency exchange rates, which is included in other revenues.

+ References

No definition available.

+ Details

Name:	wtm_ForeignExchangeDerivativesGainLoss
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Net increase or decrease in the fair value of the variable annuity death benefit liabilities included in earnings.

+ References

No definition available.

+ Details

Name:	wtm_GainLossOnLiabilityForDeathBenefit
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Net increase or decrease in the fair value of the variable annuity liabilities included in earnings.

+ References

No definition available.

+ Details

Name:	wtm_GainLossOnVariableAnnuityLiabilities
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that were not covered by collateral.

+ References

No definition available.

+ Details

Name:	wtm_NetExposureOnFairValueOfOverCounterDerivativeInstruments
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents other investment income and gains (losses) included in earnings for the period.

+ References

No definition available.

+ Details

Name:	wtm_OtherInvestmentIncomeAndGainLossOnInvestments
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the S&P creditworthiness heirarchy ratings used by the entity.

+ References

No definition available.

+ Details

Name:	wtm_SpCreditRatings
Namespace Prefix:	wtm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total nominal account value guaranteed with certain variable annuities.

+ References

No definition available.

+ Details

Name:	wtm_VariableAnnuityNominalGuaranteeValue
Namespace Prefix:	wtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	wtm_VariableAnnuityReinsuranceLineItems
Namespace Prefix:	wtm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration