Stock Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock based Compensation
Number of shares authorized (in shares)	5,925,000
Number of shares authorized, remaining (in shares)	2,816,986
Restricted stock awards
Stock based Compensation
Award vesting period	4 years
Stock compensation expense	$ 10.5	$ 0.9
Unvested stock compensation expense	$ 54.4
Unvested stock compensation expense, period for recognition	2 years
Restricted stock awards | Select Medical Corporation
Stock based Compensation
Stock compensation expense		$ 1.5	$ 0.5
Class C Restricted Interests
Stock based Compensation
Award vesting period	5 years
Fair value of vested shares			0.7
Employee Stock Option
Stock based Compensation
Award vesting period	5 years
Award expiration term	10 years
Class C Options
Stock based Compensation
Stock compensation expense			$ 0.1
Exercise of stock options, weighted average exercise price (in dollars per share)			$ 2.66
Total intrinsic value of options exercised			$ 6.3
Stock options granted during period (in shares)	0	0	0