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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 785.7	$ 817.6	$ 673.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	36.9	44.1	46.9
Stock-based compensation	61.1	59.7	58.6
Investment Income, Amortization of Discount	21.1	27.8	7.7
Other Noncash Income (Expense)	3.6	3.3	3.8
Changes in operating assets and liabilities
Prepaid expenses and other assets	(12.4)	(1.5)	9.5
Accounts payable and accrued liabilities	(28.9)	(2.2)	(13.3)
Deferred revenues	58.1	27.0	65.7
Net deferred income taxes	19.6	(66.4)	(6.2)
Net Cash Provided by (Used in) Operating Activities	902.6	853.8	831.1
Cash flows from investing activities:
Proceeds from maturities and sales of marketable securities	1,195.1	1,278.9	1,721.5
Purchases of marketable securities	(880.7)	(1,330.5)	(1,338.4)
Purchases of property and equipment	(28.1)	(45.8)	(27.4)
Net cash provided by (used in) investing activities	286.3	(97.4)	355.7
Cash flows from financing activities:
Repurchases of common stock	(1,225.6)	(901.4)	(1,048.1)
Proceeds from issuance of common stock from option exercises and employee stock purchase plans	12.3	12.3	12.3
Payment of excise tax on repurchases of common stock	(8.2)	0.0	0.0
Proceeds from (Payments for) Other Financing Activities	0.0	(0.7)	0.0
Net cash used in financing activities	(1,221.5)	(889.8)	(1,035.8)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	(0.8)	(0.1)	(0.8)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(33.4)	(133.5)	150.2
Cash and cash equivalents at end of period	206.7	240.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	212.1	245.5	379.0
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	72.8	72.8	72.8
Cash paid for income taxes, net of refunds received	$ 230.5	$ 239.7	$ 211.7

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