Debt and Credit Arrangements - Schedule of Contractual Interest Coupon and Financing Costs Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Nov. 06, 2017
Debt Instrument
2024 Notes, 1.0% contractual interest coupon	$ 85.7	$ 5.7	$ 190.7	$ 13.3
2024 Notes, financing costs amortization	4.8	0.7	12.0	2.1
Convertible notes due November 2024 | Convertible Debt
Debt Instrument
Debt instrument stated interest rate (percent)					1.00%
2024 Notes, 1.0% contractual interest coupon	0.6	0.6	1.9	1.9
2024 Notes, financing costs amortization	$ 0.2	$ 0.2	$ 0.7	$ 0.7