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Borrowings - Convertible Notes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 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	$ 6.3	17.7	$ 18.5
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%
Convertible Debt | Principal – 2026 Notes
Debt Instrument [Line Items]
Debt instrument, fair value	$ 1,100.0		$ 1,100.0		$ 1,400.0

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