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Property (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment, Net [Abstract] |
Summary of the Property Accounts | A summary of the property accounts at December 31, 2021 and 2020 is presented below:
(in millions) |  | 2021 |  | 2020 |  | Estimated Useful Life
Land and land improvements |  | $ | — |  |  | $ | 7.7 |  |  | 10 - 20 years (1)
Building and building improvements |  | 132.3 |  |  | 167.1 |  |  | 1 - 10 years
Leasehold improvements |  | 232.3 |  |  | 225.5 |  |  | 3 - 19 years
Furniture, fixtures and equipment |  | 519.1 |  |  | 492.9 |  |  | 2 - 7 years
Software and software development costs |  | 661.1 |  |  | 647.2 |  |  | 2 - 4 years
Total property |  | 1,544.8 |  |  | 1,540.4 |  |  |
Less accumulated depreciation and amortization |  | (1,039.5) |  |  | (961.2) |  |  |
Property, net |  | $ | 505.3 |  |  | $ | 579.2 |  |  |
_______________ (1) Estimated useful life applies only to land improvements. In November 2021, the company sold a building and land in Chicago for $39.3 million and recognized a gain of $30.4 million. The gain was recognized in other non-operating income in the consolidated statements of income.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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