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Stock-based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Nov. 25, 2024 shares	Nov. 04, 2024
Stock based Compensation
Number of shares authorized (in shares) | shares		6,022,665
Number of shares authorized, remaining (in shares) | shares		2,572,291
Tax Free Distribution Of Concentra Common Stock
Stock based Compensation
Percent of unvested awards receiving accelerated vesting						0.3333
Accelerated stock compensation expense | $	$ 23.6
Distribution Of Vested Concentra Shares
Stock based Compensation
Accelerated stock compensation expense | $	$ 22.3
Concentra Shareholders
Stock based Compensation
Number of Concentra shares issued for each outstanding share of Company common stock (in shares) | shares					0.806971
Restricted stock awards
Stock based Compensation
Weighted average grant date fair value of granted shares (in dollars per share) | $ / shares		$ 14.87	$ 28.38	$ 29.06
Fair value of vested shares | $		$ 29.0	$ 110.2	$ 33.9
Minimum | Restricted stock awards
Stock based Compensation
Award vesting period		3 years
Maximum | Restricted stock awards
Stock based Compensation
Award vesting period		4 years

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