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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 673.8	$ 784.8	$ 814.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	46.9	47.9	46.4
Stock-based compensation	58.6	53.4	48.2
Other Noncash Income (Expense)	(3.9)	6.0	(9.1)
Changes in operating assets and liabilities
Prepaid expenses and other assets	9.5	(14.0)	(9.2)
Accounts payable and accrued liabilities	(0.1)	15.6	2.2
Deferred revenues	65.7	90.5	29.0
Net deferred income taxes and other long term tax liabilities	(19.4)	(177.0)	(192.2)
Net Cash Provided by (Used in) Operating Activities	831.1	807.2	730.2
Cash flows from investing activities:
Proceeds from maturities and sales of marketable securities	1,721.5	2,654.5	2,305.7
Purchases of marketable securities	(1,338.4)	(2,870.7)	(2,355.4)
Purchases of property and equipment	(27.4)	(53.0)	(43.4)
Payments for (Proceeds from) Businesses and Interest in Affiliates	0.0	0.0	20.8
Net cash provided by (used in) investing activities	355.7	(269.2)	(72.3)
Cash flows from financing activities:
Repayment of Borrowings	0.0	(750.0)	0.0
Proceeds from Debt, Net of Issuance Costs	0.0	741.1	0.0
Repurchases of common stock	(1,048.1)	(722.6)	(777.5)
Proceeds from issuance of common stock from option exercises and employee stock purchase plans	12.3	12.4	12.6
Net cash used in financing activities	(1,035.8)	(719.1)	(764.9)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	(0.8)	(0.7)	0.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	150.2	(181.8)	(107.0)
Cash and cash equivalents at end of period	373.6	223.5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	379.0	228.8	410.6
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	72.8	85.6	87.4
Cash paid for income taxes, net of refunds received	$ 211.7	$ 178.4	$ 132.7

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