Stock-Based Compensation Expense and Employee Benefit Plans - Stock Awards Narrative (Details) - Restricted Stock Units - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 19.3	$ 18.4	$ 65.0	$ 64.4
Unrecognized stock-based compensation cost	$ 129.3		$ 129.3		$ 135.7
Expense expected to be recognized over a weighted-average period			2 years		1 year 10 months 24 days