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Other Assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments
Investment grade corporate and municipal bond held to maturity	$ 171,900,000
Interest receivable	1,000,000.0
Allowance for credit loss	0
Purchase of equity investment common shares	$ 0	$ 10,000,000
Record Holdings
Schedule of Equity Method Investments
Ownership percentage (percent)			18.00%
Purchase of equity investment common shares			$ 10,000,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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