Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 249.7	$ 154.5	$ 89.6
Adjustments to reconcile net income to net cash from operating activities:
Stock-based compensation expense	194.3	173.1	134.2
Depreciation	17.8	15.1	10.9
(Accretion) amortization of (discount) premium on investments, net	(18.3)	3.7	7.4
Amortization of debt discount	0.0	0.0	16.2
Amortization of debt issuance costs	0.7	1.2	1.1
Amortization of intangible assets	3.5	0.5	0.0
Changes in fair value of equity securities	(28.4)	(30.8)	(20.9)
Deferred income taxes	(56.7)	19.1	4.3
Loss on extinguishment of convertible senior notes	0.0	70.0	0.0
Other	(0.9)	0.4	(3.0)
Changes in operating assets and liabilities:
Accounts receivable	(89.3)	(162.2)	(28.4)
Inventory	5.4	(2.6)	(2.5)
Accounts payable and accrued liabilities	64.3	114.6	56.8
Other assets and liabilities, net	47.8	(17.2)	(9.2)
Cash flows from operating activities	389.9	339.4	256.5
Cash flows from investing activities:
Purchases of debt securities available-for-sale	(1,379.9)	(621.2)	(800.1)
Sales and maturities of debt securities available-for-sale	972.4	511.0	697.9
Acquisition of business, net of cash acquired	0.0	(42.7)	0.0
Purchases of equity securities	(31.3)	(7.7)	(4.6)
Capital expenditures	(28.3)	(16.5)	(23.4)
Cash flows from investing activities	(467.1)	(177.1)	(130.2)
Cash flows from financing activities:
Issuances of common stock under benefit plans	65.3	44.7	27.5
Repurchases of convertible senior notes	0.0	(279.0)	(0.1)
Cash flows from financing activities	65.3	(234.3)	27.4
Effect of exchange rate changes on cash and cash equivalents	0.3	(1.3)	0.0
Change in cash and cash equivalents and restricted cash	(11.6)	(73.3)	153.7
Cash, cash equivalents and restricted cash at beginning of period	270.7	344.0	190.3
Cash, cash equivalents and restricted cash at end of period	259.1	270.7	344.0
Supplemental Disclosure:
Non-cash capital expenditures	2.5	0.7	1.9
Right-of-use assets obtained in exchange for new operating lease liabilities	200.8	0.0	23.4
Cash paid for interest	3.8	6.6	8.6
Cash paid for income taxes	$ 51.5	$ 14.4	$ 5.1

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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No definition available.