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2020 Cash Incentive Bonus Plan (Narrative) (Details) - Cash Incentive Bonus Plan [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2021 | Oct. 13, 2020
Cash Incentive Bonus Plan [Line Items] |  |  |
Percentage of each cash bonus award associated with Valuation Milestone subject to adjustment and approval | 59.00% |  |
Payments authorized or made to participants under the Plan | $ 0.0 |  |
First Valuation Milestone [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Cash bonus award |  |  | $ 7.3
Minimum [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Valuation milestone amount in market capitalization | 200.0 |  |
Minimum [Member] | Exceeds $5 Billion Market Capitalization For No Less Than 20 Consecutive Trading Days [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Cash bonus award | 137.4 |  |
Minimum [Member] | Second Through Eighth Valuation Milestones [Member] | Subsequent Event [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Cash bonus award |  | $ 59.9 |
Maximum [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Valuation milestone amount in market capitalization | 5,000.0 |  |
Maximum [Member] | Exceeds $5 Billion Market Capitalization For No Less Than 20 Consecutive Trading Days [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Cash bonus award | $ 322.3 |  |
Maximum [Member] | Second Through Eighth Valuation Milestones [Member] | Subsequent Event [Member] |  |  |
Cash Incentive Bonus Plan [Line Items] |  |  |
Cash bonus award |  | $ 145.0 |

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