Share-Based Compensation - Stock Options Exercise Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Summary of stock option exercise data
Cash received			$ 90.7	$ 32.9
Stock options
Summary of stock option exercise data
Number of options exercised (in shares)	38,433	38,578	791,777	279,451
Cash received	$ 4.6	$ 4.7	$ 90.7	$ 32.9
Total intrinsic value of options exercised	$ 4.1	$ 4.0	$ 99.5	$ 28.3