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2020 Cash Incentive Bonus Plan (Narrative) (Details) - Cash Incentive Bonus Plan [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Dec. 31, 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 58.00%    
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
Second Through Eighth Valuation Milestones [Member]      
Cash Incentive Bonus Plan [Line Items]      
Compensation expense 0.0    
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 139.1    
Minimum [Member] | Second Through Eighth Valuation Milestones [Member]      
Cash Incentive Bonus Plan [Line Items]      
Cash bonus award   $ 93.7  
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]      
Cash Incentive Bonus Plan [Line Items]      
Cash bonus award   $ 225.0