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Fixed Assets | 12 Months Ended
--- | ---
Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Fixed Assets |
5. | Fixed Assets
Major classes of fixed assets consist of the following (in millions):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Office equipment |  | $ | 28.6 |  |  | $ | 22.5 |
Furniture and fixtures |  |  | 112.3 |  |  |  | 96.7 |
Leasehold improvements |  |  | 124.2 |  |  |  | 107.8 |
Computer equipment |  |  | 147.9 |  |  |  | 131.4 |
Land and buildings - corporate headquarters |  |  | 143.6 |  |  |  | 141.7 |
Software |  |  | 291.9 |  |  |  | 268.4 |
Other |  |  | 12.0 |  |  |  | 10.0 |
Work in process |  |  | 20.1 |  |  |  | 10.6 |
|  |  | 880.6 |  |  |  | 789.1 |
Accumulated depreciation |  |  | (468.4 | ) |  |  | (411.5 | )
Net fixed assets |  | $ | 412.2 |  |  | $ | 377.6 |
The amounts in work in process in the table above primarily are for capitalized expenditures incurred related to IT development projects in 2017 and 2016.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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