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Fixed Assets | 12 Months Ended
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Dec. 31, 2021
Property Plant And Equipment [Abstract] |
Fixed Assets | 6. Fixed Assets Major classes of fixed assets consist of the following (in millions):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Office equipment |  | $ | 36.2 |  |  | $ | 33.0 |
Furniture and fixtures |  |  | 137.1 |  |  |  | 138.3 |
Leasehold improvements |  |  | 170.8 |  |  |  | 166.0 |
Computer equipment |  |  | 247.1 |  |  |  | 214.2 |
Land and buildings - corporate headquarters |  |  | 145.3 |  |  |  | 145.1 |
Software |  |  | 532.2 |  |  |  | 452.2 |
Other |  |  | 17.2 |  |  |  | 16.7 |
Work in process |  |  | 23.0 |  |  |  | 14.1 |
|  |  | 1,308.9 |  |  |  | 1,179.6 |
Accumulated depreciation |  |  | (808.1 | ) |  |  | (728.9 | )
Net fixed assets |  | $ | 500.8 |  |  | $ | 450.7 |
The amounts in work in process in the table above primarily are for capitalized expenditures incurred related to IT development projects in 2021 and 2020.

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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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