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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 392.9	$ 364.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	19.1	22.9
Stock-based compensation	29.4	29.5
Investment Income, Amortization of Discount	(11.1)	(9.3)
Other Noncash Income (Expense)	(1.6)	(2.0)
Changes in operating assets and liabilities
Other assets	(19.2)	(1.0)
Other Liabilities	(58.8)	(48.7)
Deferred revenues	42.6	41.5
Deferred Income Taxes	21.2	3.0
Net cash provided by operating activities	417.7	404.3
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of marketable securities	727.6	721.3
Purchases of marketable securities	(468.1)	(697.6)
Purchases of property and equipment	(13.0)	(12.2)
Net cash used in investing activities	246.5	11.5
Cash flows from financing activities:
Payments for Repurchase of Common Stock	660.2	453.4
Proceeds from employee stock purchase plans	8.3	8.0
Net cash used in financing activities	(651.9)	(445.4)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(0.3)	(0.2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	12.0	(29.8)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning of period	245.5	379.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, end of period	257.5	349.2
Supplemental cash flow disclosures:
Cash paid for interest	36.4	36.4
Cash paid for income taxes, net of refunds received	$ 138.6	$ 132.4

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