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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2022
Jun. 20, 2023
Class of Stock [Line Items]        
Reclassification of stock-based compensation liability to equity     $ (1.9)  
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation   $ (1.9)    
Stock Issued During Period, Shares, New Issues 176,628 722,568    
Stock Issued During Period, Value, Gross $ 7.4 $ 24.4    
Stock Issued During Period, Value, Net 7.1 23.4    
Direct Costs of Stock Issuance $ 0.1 0.2    
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
Preferred Stock [Member]        
Class of Stock [Line Items]        
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation   0.0    
Common Stock [Member] | Common Class A [Member]        
Class of Stock [Line Items]        
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation   0.0    
Excess of Capital over Par Value [Member]        
Class of Stock [Line Items]        
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation   $ (1.9)