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Stock-Based Compensation - Employee Stock Option and Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock-Based Compensation
Weighted average period compensation cost is expected to be recognized (in years)	2 years 7 months 6 days
Employee Stock Option
Stock-Based Compensation
Shares outstanding (in shares)	2,055,002
Vesting period (in years)	4 years
Expiration period (in years)	10 years
Intrinsic value of stock options exercised	$ 2.7	$ 12.8	$ 9.4
Weighted average grant-date fair value (in dollars per share)	$ 28.15	$ 17.60	$ 22.16
Fair value of stock options vested	$ 20.4	$ 15.6	$ 5.9
Intrinsic value of stock options outstanding	98.6
Intrinsic value of stock options vested and expected to vest	97.6
Intrinsic value of stock options exercisable	68.9
Compensation cost not yet recognized	$ 61.9
Employee Stock Option | 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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