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Property and Equipment | 12 Months Ended
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Sep. 30, 2021
Property and Equipment |
Property and Equipment | 5. Property and Equipment Property and equipment, at cost, consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year Ended | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | September 30, | ​ | Useful Lives
​ |  | 2021 |  | 2020 |  | (years)
​ | ​ | (in millions) | ​ | ​ | ​ | ​
Building and land | ​ | $ | 14.4 | ​ | $ | 11.5 |  | 10 | - | 45
Leasehold improvements | ​ |  | 351.2 | ​ |  | 343.2 |  | 1 | - | 20
Computer systems and equipment | ​ |  | 602.1 | ​ |  | 557.4 |  | 3 | - | 12
Furniture and fixtures | ​ |  | 112.7 | ​ |  | 134.8 |  | 3 | - | 10
Total | ​ |  | 1,080.4 | ​ |  | 1,046.9 | ​ | ​ | ​ | ​
Accumulated depreciation and amortization | ​ |  | (681.5) | ​ |  | (665.2) | ​ | ​ | ​ | ​
Property and equipment, net | ​ | $ | 398.9 | ​ | $ | 381.7 | ​ | ​ | ​ | ​
​ Depreciation expense for the fiscal years ended September 30, 2021, 2020 and 2019 were $143.6 million, $163.4 million, and $137.5 million, respectively. Depreciation is calculated using primarily the straight-line method over the estimated useful lives of the assets, or in the case of leasehold improvements and capitalized leases, the lesser of the remaining term of the lease or its estimated useful life.

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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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