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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 06, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Operating Loss Carryforwards [Line Items]        
Income tax expense   $ 3.3 $ 0.9  
Income tax provision, interim tax     1.1  
Deferred tax benefit   0.1 (5.4)  
Deferred tax liability   4.2   $ 4.1
Reduced deferred tax asset carryforward   58.7 58.7  
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards       179.2
Operating loss carryforwards, US       $ 119.2
Domestic Tax Authority | Various Nonconsolidated Subsidiaries        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   138.0    
Net operating loss, not subject to expiration   101.9    
Net operating losses subject to expiration   36.1    
Domestic Tax Authority | R2 Technologies        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   92.9    
Domestic Tax Authority | DTV America        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   42.7    
Domestic Tax Authority | Other Entities        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   $ 2.4    
HMN        
Operating Loss Carryforwards [Line Items]        
Current foreign tax expense (benefit) $ 4.4   4.4  
Deferred tax benefit     (5.5)  
Deferred tax liability     $ 11.3  
Ownership percentage sold 19.00%