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Property (Tables) | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment, Net [Abstract] |
Summary of the Property Accounts | A summary of the property accounts at December 31, 2023 and 2022 is presented below:
(in millions) |  | 2023 |  | 2022 |  | Estimated Useful Life
Building and building improvements |  | $ | 130.7 |  |  | $ | 132.2 |  |  | 1 - 10 years
Leasehold improvements |  | 143.7 |  |  | 224.8 |  |  | 3 - 19 years
Furniture, fixtures and equipment |  | 413.3 |  |  | 551.3 |  |  | 2 - 7 years
Software and software development costs |  | 654.9 |  |  | 692.4 |  |  | 2 - 4 years
Total property |  | 1,342.6 |  |  | 1,600.7 |  |  |
Less accumulated depreciation and amortization |  | (933.1) |  |  | (1,145.2) |  |  |
Property, net |  | $ | 409.5 |  |  | $ | 455.5 |  |  |

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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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