Convertible Debt (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2021	Dec. 31, 2019	Mar. 31, 2023
1.75% Notes [Member]
Convertible Debt [Abstract]
Face amount of offering		$ 575.0
Repurchase of convertible senior notes		$ 488.2
Outstanding principal balance	$ 575.0
Unamortized debt issuance costs	$ 12.0
Maturity date	Jun. 30, 2028
Interest rate	1.75%
Effective interest rate	2.30%
Conversion price per share (in dollars per share)	$ 53.73
Total shares of common stock subject to conversion (in shares)	10.7
Percentage of principal amount used as purchase price upon occurrence of fundamental change	100.00%
0% Notes [Member]
Convertible Debt [Abstract]
Outstanding principal balance	$ 632.5
Unamortized debt issuance costs	$ 6.3
Maturity date	Apr. 30, 2026
Interest rate	0.00%	0.00%			0.00%
Effective interest rate	0.50%
Conversion price per share (in dollars per share)	$ 57.84
Effective conversion price per share with call spread (in dollars per share)	$ 76.39
Total shares of common stock subject to conversion (in shares)	10.9
Cost of call spread			$ 46.9
Purchase of note hedges			136.7
Proceeds from issuance of warrants			$ 89.8
Percentage of principal amount used as purchase price upon occurrence of fundamental change	100.00%
0.125% Notes [Member]
Convertible Debt [Abstract]
Repurchase of convertible senior notes		$ 504.4
Outstanding principal balance	$ 44.5
Unamortized debt issuance costs	$ 0.1
Maturity date	Dec. 31, 2024
Interest rate	0.125%	0.125%			0.125%
Effective interest rate	0.50%
Conversion price per share (in dollars per share)	$ 83.28
Effective conversion price per share with call spread (in dollars per share)	$ 123.38
Total shares of common stock subject to conversion (in shares)	0.5
Cost of call spread				$ 52.6
Purchase of note hedges				108.7
Proceeds from issuance of warrants				$ 56.1
Percentage of principal amount used as purchase price upon occurrence of fundamental change	100.00%