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Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
2 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2023
Aug. 11, 2023
Sep. 30, 2023
Sep. 30, 2022
Aug. 12, 2023
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]              
Gross carrying amount $ 898.0   $ 898.0     $ 1,004.9  
Less accumulated amortization (13.9)   (13.9)   $ 0.0 (747.3)  
Intangible assets, net 884.1   $ 884.1     257.6  
Payments to Develop Software 3.7 $ 13.1   $ 24.0      
Fresh Start Accounting adjustment   (23.3)          
Amortization of internally-developed software (0.8) (12.4)   (19.7)      
Customer relationships, net              
Finite-Lived Intangible Assets [Line Items]              
Weighted-average remaining useful lives     16 years 4 months 24 days        
Gross carrying amount 537.0   $ 537.0     662.3  
Less accumulated amortization (4.4)   (4.4)     (448.7)  
Intangible assets, net 532.6   $ 532.6   554.3 213.6  
Trade name/trademark              
Finite-Lived Intangible Assets [Line Items]              
Weighted-average remaining useful lives     17 years 4 months 24 days        
Gross carrying amount 115.8   $ 115.8     0.0  
Less accumulated amortization (0.9)   (0.9)     0.0  
Intangible assets, net 114.9   $ 114.9     0.0  
Capitalized software development              
Finite-Lived Intangible Assets [Line Items]              
Weighted-average remaining useful lives     2 years 10 months 24 days        
Gross carrying amount 16.8   $ 16.8     245.2  
Less accumulated amortization (0.8)   (0.8)     (202.7)  
Intangible assets, net 16.0   $ 16.0 38.5   42.5 $ 43.2
Capitalized Computer Software, Period Increase (Decrease) (0.7) $ (6.1)   $ (9.0)      
Transfer To Held For Sale 13.8            
Development costs non-software              
Finite-Lived Intangible Assets [Line Items]              
Weighted-average remaining useful lives     5 years 9 months 18 days        
Gross carrying amount 188.5   $ 188.5     48.7  
Less accumulated amortization (4.4)   (4.4)     (48.7)  
Intangible assets, net 184.1   $ 184.1     0.0  
Other intangibles              
Finite-Lived Intangible Assets [Line Items]              
Weighted-average remaining useful lives     1 year 6 months        
Gross carrying amount 39.9   $ 39.9     48.7  
Less accumulated amortization (3.4)   (3.4)     (47.2)  
Intangible assets, net 36.5   36.5     1.5  
Other intangible assets, net              
Finite-Lived Intangible Assets [Line Items]              
Gross carrying amount 361.0   361.0     342.6  
Less accumulated amortization (9.5)   (9.5)     (298.6)  
Intangible assets, net $ 351.5   $ 351.5   $ 365.1 $ 44.0