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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Property and Equipment at Cost and Depreciable Useful Lives | Cost and estimated useful lives of property and equipment by function are as follows (in millions of dollars):
Category |  | 2023 |  | 2022 |  | Useful Life
Land |  | $ | — |  |  | $ | — |  |  |  | — |
Work in process |  | 6.7 |  |  | 3.0 |  |  |  | — |
Buildings and improvements |  | 0.4 |  |  | 0.4 |  |  |  | 30 | years
Computer hardware and software |  | 123.1 |  |  | 126.8 |  |  | 3 | to | 12 years
Equipment, furniture and fixtures |  | 22.6 |  |  | 22.7 |  |  |  | 5 | years
Leasehold improvements |  | 13.1 |  |  | 13.9 |  |  | HQ: 15 years
|  |  |  |  |  | Branches: Lesser of the lease or 5 years
Total property and equipment |  | $ | 165.9 |  |  | $ | 166.8 |  |  |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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