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Impairment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	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

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