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Summary of Significant Accounting Policies - Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary of Significant Accounting Policies |  |  |
Capitalized deferred leasing cost | $ 43.1 | $ 51.8 | $ 42.8
Deferred leasing costs | 220.5 | 257.0 |
Accumulated amortization, deferred leasing costs and intangibles | 558.3 | 514.3 |
Amortization expense on deferred leasing costs | $ 76.8 | $ 79.2 | $ 83.4

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- Definition Accumulated amortization of acquired in-place lease value, deferred leasing costs and intangibles. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of amortization of lease cost. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of deferred leasing cost capitalized during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481178/840-20-25-16 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 35 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481123/840-20-35-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479341/842-30-25-10 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 840 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481178/840-20-25-17 + Details
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