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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 01, 2024
USD ($)
bed
Mar. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
hospital
state
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Number of states in which entity operates | state     38    
Number of inpatient rehabilitation hospitals | hospital     166    
Number of inpatient rehabilitation hospitals, sole ownership | hospital     101    
Number of jointly owned inpatient rehabilitation hospitals | hospital     65    
Contributions from noncontrolling interests of consolidated affiliates     $ 140.4 $ 68.3 $ 64.1
Minimum accrual of loss contingency needed to accrue for related legal fees     5.0    
Advertising expense     5.8 6.1 $ 6.3
Hospital in Augusta, Georgia | Corporate Joint Venture          
Finite-Lived Intangible Assets [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     $ 23.2    
Market access assets          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset useful life     20 years    
ALJ, Adverse Ruling          
Finite-Lived Intangible Assets [Line Items]          
Amount of claims pending review     $ 4.0    
DAB, Adverse Ruling          
Finite-Lived Intangible Assets [Line Items]          
Amount of claims pending review     30.0    
Appealed claims denied     7.0    
Pending appeals additional reserve       $ 21.9  
UPICs Audits          
Finite-Lived Intangible Assets [Line Items]          
Alleged overpayment amount     $ 18.0    
SMRC          
Finite-Lived Intangible Assets [Line Items]          
Review of claims initiated amount   $ 21.0      
Approved claims (in percent)     0.89    
Claims under appeal amount     $ 0.1    
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | RAC Audits          
Finite-Lived Intangible Assets [Line Items]          
Percentage of Medicare patient discharges (percent)     1.00%    
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Joint venture ownership percentage     50.00%    
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Joint venture ownership percentage     97.50%