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Summary of Significant Accounting Policies and Procedures and Newly Adopted Accounting Standards (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of reconciliation of the denominator of the diluted net income per common share computation | The following is a reconciliation of the denominator of the basic net income per common share computation to the denominator of the diluted net income per common share computation.
|  | 2020 |  | 2019 |  | 2018
Weighted average shares used for the basic net income per share computation |  | 345,280,126 |  |  | 315,837,012 |  |  | 289,427,430 |
Incremental shares from share-based compensation |  | 135,132 |  |  | 322,265 |  |  | 179,532 |
Weighted average partnership common units convertible to common shares that were dilutive |  | — |  |  | — |  |  | 317,022 |
Weighted average shares used for diluted net income per share computation |  | 345,415,258 |  |  | 316,159,277 |  |  | 289,923,984 |
Unvested shares from share-based compensation that were anti-dilutive |  | 70,581 |  |  | 8,113 |  |  | 13,148 |
Weighted average partnership common units convertible to common shares that were anti-dilutive |  | 463,119 |  |  | 442,073 |  |  | 297,576 |
Schedule of reserves recorded as reduction of rental revenue | The following table summarizes reserves recorded as a reduction of rental revenue (dollars in millions):
|  | Year ended December 31,
|  | 2020 |  | 2019 |  | 2018
Rental revenue reserves |  | $ | 44.1 |  |  | $ | 1.4 |  |  | $ | 1.1 |
Straight-line rent reserves |  | 8.4 |  |  | 1.5 |  |  | 0.2 |
Total rental revenue reserves |  | $ | 52.5 |  |  | $ | 2.9 |  |  | $ | 1.3 |
Schedule of estimated useful lives of assets | Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:
Buildings | 25 years or 35 years
Building improvements | 4 to 35 years
Equipment | 5 to 25 years
Lease commissions and property improvements to accommodate the client's use | The shorter of the term of the related lease or useful life
Acquired in-place leases | Remaining terms of the respective leases
Schedule of provisions for impairment | The following table summarizes our provisions for impairment during the periods indicated below (dollars in millions):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Total provisions for impairment | $ | 147.2 |  |  | $ | 40.2 |  |  | $ | 26.3 |
Number of properties: |  |  |  |  |
Classified as held for sale | 6 |  |  | 1 |  |  | — |
Classified as held for investment | 42 |  |  | 5 |  |  | 3 |
Sold | 51 |  |  | 45 |  |  | 41 |

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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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