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Stock-Based Compensation - Employee Stock Option (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock-Based Compensation
Weighted average period compensation cost is expected to be recognized (in years)	2 years 7 months 6 days
Stock Options
Stock-Based Compensation
Shares outstanding (in shares)	1,513,850
Vesting period (in years)	4 years
Expiration period (in years)	10 years
Intrinsic value of stock options exercised	$ 17.2	$ 2.7	$ 12.8
Weighted average grant-date fair value (in dollars per share)	$ 26.21	$ 28.15	$ 17.6
Fair value of stock options vested	$ 32.4	$ 20.4	$ 15.6
Intrinsic value of stock options outstanding	24.4
Intrinsic value of stock options vested and expected to vest	24.4
Intrinsic value of stock options exercisable	23.0
Compensation cost not yet recognized	$ 77.1
Stock Options | Principal Owner
Stock-Based Compensation
Expiration period (in years)	5 years
Exercise price as a percentage of fair market value	110.00%

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Represents the exercise price as a percentage of the fair market for options granted to the holders of than 10 percent of voting stock of the entity.

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