XML 89 R43.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Lease, Cost

The following table summarizes net lease expense recognized in White Mountains’s consolidated statement of operations for the year ended December 31, 2019:

Millions Lease Cost		December 31, 2019
Lease cost		$	7.2
Less: sublease income		.4
Net lease cost		$	6.8

Lessee, Operating Lease, Liability, Maturity

The following table presents the contractual maturities of the lease liabilities associated with White Mountains’s operating lease agreements as of December 31, 2019:

Millions		As of December 31, 2019
2020		$	5.9
2021		4.9
2022		4.5
2023		3.9
2024		3.1
Thereafter		3.4
Total undiscounted lease payments		25.7
Less: present value adjustment		(2.9		)
Operating lease liability		$	22.8

Schedule of Right-of-Use Assets and Lease Liabilities

The following table presents lease related assets and liabilities by reportable segment as of December 31, 2019:

		As of December 31, 2019
$ in Millions		HG/BAM				NSM				Kudu				Other Operations				Total				Weighted Average Incremental Borrowing Rate (1)
ROU lease asset		$	10.4			$	4.8			$	2.3			$	5.1			$	22.6			4.6%
Lease liability		$	10.4			$	4.8			$	2.3			$	5.3			$	22.8

⁽¹⁾ The present value of the remaining lease payments was determined by discounting the lease payments using the incremental borrowing rate.

X

- Definition

Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

Name:	us-gaap_LeaseCostTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of Right-of-Use Assets and Lease Liabilities [Table Text Block]

+ References

No definition available.

+ Details

Name:	wtm_ScheduleofRightofUseAssetsandLeaseLiabilitiesTableTextBlock
Namespace Prefix:	wtm_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration