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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases [Abstract] |
Schedule of net lease expense | The following table summarizes net lease expense recognized in White Mountains’s consolidated statement of operations for the years ended December 31, 2021 and 2020:
Millions Lease Cost |  | December 31, 2021 |  | December 31, 2020 |  |
Lease cost |  | $ | 9.9 |  |  | $ | 7.7 |  |  |
Less: sublease income |  | .4 |  |  | .4 |  |  |
Net lease cost |  | $ | 9.5 |  |  | $ | 7.3 |  |  |
Schedule of contractual maturities of lease liabilities | The following table presents the contractual maturities of the lease liabilities associated with White Mountains’s operating lease agreements as of December 31, 2021:
Millions |  | December 31, 2021
2022 |  | $ | 10.9 |
2023 |  | 9.9 |
2024 |  | 8.5 |
2025 |  | 6.8 |
2026 |  | 4.3 |
Thereafter |  | 11.9 |
Total undiscounted lease payments |  | 52.3 |
Less: present value adjustment |  | (7.1) |
Operating lease liability |  | $ | 45.2 |
Schedule of lease related assets and liabilities | The following table presents lease related assets and liabilities by reportable segment as of December 31, 2021 and 2020:
|  | As of December 31, 2021
$ in Millions |  | HG/BAM |  | Ark |  | NSM |  | Kudu |  | Other Operations |  | Total |  | Weighted Average Incremental Borrowing Rate (1)
ROU lease asset |  | $ | 7.6 |  |  | $ | 7.0 |  |  | $ | 14.0 |  |  | $ | 6.5 |  |  | $ | 7.1 |  |  | $ | 42.2 |  |  | 5%
Lease liability |  | $ | 8.1 |  |  | $ | 7.0 |  |  | $ | 15.2 |  |  | $ | 7.1 |  |  | $ | 7.8 |  |  | $ | 45.2 |  |
(1) The present value of the remaining lease payments was determined by discounting the lease payments using the incremental borrowing rate.
|  | December 31, 2020
$ in Millions |  | HG/BAM |  | NSM |  | Kudu |  | Other Operations |  | Total |  | Weighted Average Incremental Borrowing Rate (1)
ROU lease asset |  | $ | 10.1 |  |  | $ | 17.1 |  |  | $ | 2.0 |  |  | $ | 8.4 |  |  | $ | 37.6 |  |  | 4.6%
Lease liability |  | $ | 10.1 |  |  | $ | 17.1 |  |  | $ | 2.0 |  |  | $ | 9.1 |  |  | $ | 38.3 |  |
(1) The present value of the remaining lease payments was determined by discounting the lease payments using the incremental borrowing rate.

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- 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=123408670&loc=SL77918686-209980 + Details
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- 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=123408670&loc=SL77918701-209980 + Details
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- Definition Schedule of Right-of-Use Assets and Lease Liabilities [Table Text Block] + References No definition available. + Details
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