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Schedule I - Condensed Financial Information of Registrant Condensed Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current assets        
Total current assets $ 306.9 $ 310.9    
Noncurrent assets        
Total assets 1,048.7 1,053.9    
Current liabilities        
Total current liabilities 241.3 230.1    
Noncurrent liabilities        
Total liabilities 662.8 649.3    
Stockholders' deficit        
Common stock, $0.01 par value; authorized shares at December 31, 2024 and 2023: 800,000; 201,447 and 62,915 shares issued and outstanding at December 31, 2024 and 2023, respectively 2.0 0.6    
Additional paid-in capital 1,034.0 559.2    
Accumulated deficit (650.1) (652.3)    
Total stockholders' equity (deficit) 385.9 (92.5) $ (33.1) $ (121.0)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) 1,048.7 1,053.9    
7% Series A Convertible Participating Preferred Stock [Member]        
Redeemable convertible preferred stock        
7% Series A Convertible Participating Preferred Stock, $0.01 par value; authorized shares at December 31, 2024 and 2023: 80,000; zero and 71,403 shares issued and outstanding; aggregate liquidation preference of zero and $492.6 million at December 31, 2024 and 2023, respectively 0.0 497.1    
Parent Company [Member]        
Noncurrent assets        
Investment in subsidiaries 385.9 404.6    
Total assets 385.9 404.6    
Stockholders' deficit        
Common stock, $0.01 par value; authorized shares at December 31, 2024 and 2023: 800,000; 201,447 and 62,915 shares issued and outstanding at December 31, 2024 and 2023, respectively 2.0 0.6    
Additional paid-in capital 1,034.0 559.2    
Accumulated deficit (650.1) (652.3)    
Total stockholders' equity (deficit) 385.9 (92.5)    
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) $ 385.9 404.6    
Parent Company [Member] | 7% Series A Convertible Participating Preferred Stock [Member]        
Redeemable convertible preferred stock        
7% Series A Convertible Participating Preferred Stock, $0.01 par value; authorized shares at December 31, 2024 and 2023: 80,000; zero and 71,403 shares issued and outstanding; aggregate liquidation preference of zero and $492.6 million at December 31, 2024 and 2023, respectively   $ 497.1