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Basis of Presentation - Additional Information (Details)
$ in Millions
 9 Months Ended
Jul. 01, 2024
USD ($)
bed
Sep. 30, 2025
USD ($)
hospital
state
Sep. 30, 2024
USD ($)
Class of Stock [Line Items]      
Number of states in which entity operates | state   39  
Number of inpatient rehabilitation hospitals operated | hospital   170  
Number of solely owned inpatient rehabilitation hospitals | hospital   104  
Number of jointly owned inpatient rehabilitation hospitals | hospital   66  
Contributions from noncontrolling interests of consolidated affiliates | $   $ 0.0 $ 139.7
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
Minimum      
Class of Stock [Line Items]      
Joint venture ownership percentage   50.00%  
Maximum      
Class of Stock [Line Items]      
Joint venture ownership percentage   97.50%