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Property | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment, Net [Abstract] |
Property | PROPERTY 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 The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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