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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 $ 817.6 $ 673.8 $ 784.8
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 44.1 46.9 47.9
Stock-based compensation 59.7 58.6 53.4
Investment Income, Amortization of Discount 27.8 7.7 0.4
Other Noncash Income (Expense) 3.3 3.8 6.4
Changes in operating assets and liabilities      
Prepaid expenses and other assets (1.5) 9.5 (14.0)
Accounts payable and accrued liabilities (2.2) (13.3) 1.4
Deferred revenues 27.0 65.7 90.5
Net deferred income taxes and other long term tax liabilities (66.4) (6.2) (162.8)
Net Cash Provided by (Used in) Operating Activities 853.8 831.1 807.2
Cash flows from investing activities:      
Proceeds from maturities and sales of marketable securities 1,278.9 1,721.5 2,654.5
Purchases of marketable securities (1,330.5) (1,338.4) (2,870.7)
Purchases of property and equipment (45.8) (27.4) (53.0)
Net cash provided by (used in) investing activities (97.4) 355.7 (269.2)
Cash flows from financing activities:      
Repurchases of common stock (901.4) (1,048.1) (722.6)
Proceeds from issuance of common stock from option exercises and employee stock purchase plans 12.3 12.3 12.4
Repayment of Borrowings 0.0 0.0 (750.0)
Proceeds from Debt, Net of Issuance Costs 0.0 0.0 741.1
Proceeds from (Payments for) Other Financing Activities (0.7) 0.0 0.0
Net cash used in financing activities (889.8) (1,035.8) (719.1)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations (0.1) (0.8) (0.7)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (133.5) 150.2 (181.8)
Cash and cash equivalents at end of period 240.1 373.6  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 245.5 379.0 228.8
Supplemental cash flow disclosures:      
Cash paid for interest, net of capitalized interest 72.8 72.8 85.6
Cash paid for income taxes, net of refunds received $ 239.7 $ 211.7 $ 178.4