Debt - Components of Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Total interest recognized on the Convertible Notes	$ 10.4	$ 9.2	$ 29.5	$ 27.3
0.375% Convertible Senior Notes due September 2026 | Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	0.8	0.8	2.3	2.3
Amortization of debt issuance costs	0.7	0.7	2.2	2.2
Total interest recognized on the Convertible Notes	$ 1.5	$ 1.5	$ 4.5	$ 4.5