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Debt - Carrying Amounts of the Liability and Equity Components (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jul. 01, 2023	Mar. 06, 2023	Sep. 29, 2021	Mar. 03, 2017
Carrying amounts of the liability and equity components:
Short-term debt	$ 96.2	$ 96.2
Unamortized notes debt issuance cost	(2.5)	(2.8)
Long-term debt	$ 631.1	629.5
Convertible Notes \| 1.00% Senior Convertible Notes
Carrying amounts of the liability and equity components:
Stated interest rate	1.00%				1.00%
Principal amount of notes	$ 96.4	96.4
Unamortized debt issuance costs	$ (0.2)	(0.2)
Convertible Notes \| 3.75% Senior Convertible Notes
Carrying amounts of the liability and equity components:
Stated interest rate	3.75%
Convertible Notes \| 1.625% Senior Convertible Notes
Carrying amounts of the liability and equity components:
Stated interest rate	1.625%		1.625%
Principal amount of notes	$ 250.0	250.0
Unamortized debt discount	(11.7)	(12.9)
Unamortized notes debt issuance cost	$ (1.9)	(2.1)
Senior Notes \| 3.75% Senior Convertible Notes
Carrying amounts of the liability and equity components:
Stated interest rate	3.75%			3.75%
Principal amount of notes	$ 400.0	400.0
Unamortized notes debt issuance cost	$ (5.3)	$ (5.5)