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Commitments And Contingencies Purchase Commitments and Minimum Licensing Fees (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Long-term Purchase Commitment [Line Items]
Purchase commitments	$ 73,000,000
Purchase Obligation, Fiscal Year Maturity [Abstract]
2020	44,000,000
2021	24,000,000
2022	11,000,000
2023	9,000,000
2024	8,000,000
Thereafter	217,000,000
Total purchase obligations	313,000,000
Sotheby’s International Realty®
Long-term Purchase Commitment [Line Items]
Licensing fees	2
Meredith Corporation | Minimum
Long-term Purchase Commitment [Line Items]
Licensing fees	0.5
Meredith Corporation | Maximum
Long-term Purchase Commitment [Line Items]
Licensing fees	$ 4

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- Definition

A sum paid to use a copyrighted item, such as a brand name, that is owned by someone else.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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- Definition

Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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