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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