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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2023
Jun. 20, 2023
Dec. 31, 2022
Class of Stock [Line Items]            
Exchange of preferred stock for common stock and common stock warrant     $ 10.6      
Reclassification of stock-based compensation liability to equity     (1.9)      
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ (1.1) $ (1.9)        
Awards Under Executive Incentive Plan Period           3 years
Preferred Stock, Par Value Per Share       $ 1.00 $ 1.00  
Minimum [Member]            
Class of Stock [Line Items]            
Purchase Price Increase Per Share         18.00  
Maximum [Member]            
Class of Stock [Line Items]            
Purchase Price Increase Per Share         $ 160.38  
Common Class A [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues       722,568    
Stock Issued During Period, Value, Gross       $ 24.4    
Stock Issued During Period, Value, Net       23.4    
Direct Costs of Stock Issuance       $ 0.2    
Preferred Stock [Member]            
Class of Stock [Line Items]            
Reclassification of stock-based compensation liability to equity     0.0      
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation 0.0 0.0 0.0      
Common Stock [Member] | Common Class A [Member]            
Class of Stock [Line Items]            
Reclassification of stock-based compensation liability to equity     0.0      
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation 0.0 0.0 0.0      
Excess of Capital over Par Value [Member]            
Class of Stock [Line Items]            
Reclassification of stock-based compensation liability to equity     10.6      
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ (1.1) $ (1.9) $ (1.9)