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Basis of Presentation - Additional Information (Details)
$ in Millions
 9 Months Ended
Jul. 01, 2024
USD ($)
bed
Jun. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
hospital
state
Sep. 30, 2023
USD ($)
Jul. 01, 2023
bed
Class of Stock [Line Items]          
Number of states in which entity operates | state     38    
Number of inpatient rehabilitation hospitals operated | hospital     165    
Number of solely owned inpatient rehabilitation hospitals | hospital     100    
Number of jointly owned inpatient rehabilitation hospitals | hospital     65    
Contributions from noncontrolling interests of consolidated affiliates     $ 139.7 $ 54.7  
Hospital in Augusta, Georgia | Corporate Joint Venture          
Class of Stock [Line Items]          
Number of beds | bed 70        
Contributions from noncontrolling interests of consolidated affiliates $ 90.0        
Remaining noncontrolling interest 50.00%        
Post-tax gain increasing capital in excess of par     $ 22.9    
Hospital in Bowie, Maryland | Corporate Joint Venture          
Class of Stock [Line Items]          
Number of beds | bed         60
Contributions from noncontrolling interests of consolidated affiliates   $ 26.3      
Remaining noncontrolling interest         50.00%
Minimum          
Class of Stock [Line Items]          
Joint venture ownership percentage     50.00%    
Maximum          
Class of Stock [Line Items]          
Joint venture ownership percentage     97.50%