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Fair Value Measurements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 1,200,000 | $ 0 | $ 0
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 0 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 0 |
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount | 0 | 0 |
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount | 0 | 0 |
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 0 | 0 | 0
Total debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | $ 10,500,000 | $ 10,000,000.0 | $ (6,700,000)

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