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PROPERTY AND EQUIPMENT. | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT | PROPERTY AND EQUIPMENT. Property and equipment at December 31 consists of:
(in millions) | 2018 |  | 2017
Computer and communications software and equipment | $ | 864.7 |  |  | $ | 824.4 |
Buildings and improvements | 454.5 |  |  | 442.5 |
Leasehold improvements | 137.0 |  |  | 121.0 |
Furniture and other equipment | 178.9 |  |  | 168.9 |
Land | 37.4 |  |  | 37.4 |
Leased land | 2.7 |  |  | 2.7 |
| 1,675.2 |  |  | 1,596.9 |
Less accumulated depreciation and amortization | 1,013.9 |  |  | 944.9 |
Total | $ | 661.3 |  |  | $ | 652.0 |
Compensation and related costs attributable to the development of computer software for internal use, totaling $85.5 million in 2018, $62.3 million in 2017, and $28.9 million in 2016, have been capitalized. We occupy certain office facilities and lease computer and other equipment under noncancelable operating leases. Related rental expense was $40.1 million in 2018, $36.0 million in 2017, and $32.8 million in 2016. Future minimum payments under these leases aggregate to: $31.5 million in 2019, $26.8 million in 2020, $22.9 million in 2021, $17.9 million in 2022, $15.2 million in 2023, and $53.4 million in later years.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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