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Investments in and Advances to Unconsolidated Affiliates - Mervyns I & II - Additional Information (Details) shares in Millions, $ in Millions	6 Months Ended	174 Months Ended
	Jun. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares
Mervyns II
Schedule of Equity Method Investments [Line Items]
Cost method investment, ownership percentage	28.30%	28.30%
Realized gain on investment	$ 23.2
Cost method investments effective ownership, shares | shares	4.1	4.1
Cost method investments effective ownership interest	1.00%	1.00%
Unrealized gain on investment	$ 64.9
Albertson
Schedule of Equity Method Investments [Line Items]
Cost method investment, ownership percentage	36.67%	36.67%
Albertson | Mervyns II
Schedule of Equity Method Investments [Line Items]
Related party revenue		$ 110.0

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