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Investments in and Advances to Unconsolidated Affiliates - Mervyns I & II - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020
Mervyns II |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investment, ownership percentage | 28.33% |  |  |
Realized gain on investment | $ 0.4 | $ 0.4 | $ 22.8 |
Cost method investments effective ownership, shares | 4.1 |  |  |
Cost method investments effective ownership interest | 1.00% |  |  |
Unrealized gain on investment |  |  | $ 64.9 |
Albertson |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cost method investment, ownership percentage | 36.67% |  |  |
Albertson | Mervyns II |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Unrealized gain on investment | $ 6.1 |  |  | $ 7.5

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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period and/or any unrealized gains or losses on investments that are separately or otherwise not categorized as trading or available-for-sale. + References No definition available. + Details
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