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Impairment - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Dec. 31, 2020
Disposal Group, Held-for-sale, Not Discontinued Operations | Corporate Headquarters Building |  |
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items] |  |
Impairment of real estate | $ 38.0 | $ 38.0

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- Definition [Line Items] for Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Table] + References No definition available. + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Details
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- Details
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