Borrowings - Convertible Notes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Principal – 2026 Notes
Debt Instrument [Line Items]
Debt face amount		$ 1,200.0		$ 1,200.0
Convertible Debt
Debt Instrument [Line Items]
Debt face amount		2,200.0		2,200.0
Convertible Debt | 2026 and 2027 Notes
Debt Instrument [Line Items]
Interest expense related to amortization of debt		5.8	$ 1.1	11.9	$ 2.2
Convertible Debt | Principal – 2026 Notes
Debt Instrument [Line Items]
Debt instrument, fair value		1,100.0		1,100.0		$ 1,400.0
Convertible Debt | Principal – 2027 Notes
Debt Instrument [Line Items]
Debt face amount		1,000.0		1,000.0
Debt instrument, fair value		$ 1,000.0		$ 1,000.0		$ 1,300.0
Redemption price percentage	100.00%