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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net income $ 594.2 $ 552.9
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property and equipment 28.1 33.7
Stock-based compensation 45.2 45.0
Investment Income, Amortization of Discount (16.6) (18.6)
Other Noncash Income (Expense) (2.1) (3.0)
Changes in operating assets and liabilities    
Other assets (18.2) (3.7)
Other Liabilities (31.9) (16.2)
Deferred revenues 52.9 43.0
Deferred Income Taxes 15.3 10.5
Net cash provided by operating activities 671.1 649.6
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Proceeds from maturities and sales of marketable securities 1,009.6 750.8
Purchases of marketable securities (684.0) (911.5)
Purchases of property and equipment (18.6) (40.8)
Net cash used in investing activities 307.0 (201.5)
Cash flows from financing activities:    
Payments for Repurchase of Common Stock 963.3 675.8
Proceeds from employee stock purchase plans 12.3 12.3
Net cash used in financing activities (951.0) (663.5)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0.1 (0.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 27.2 (216.0)
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 272.7 163.0
Supplemental cash flow disclosures:    
Cash paid for interest 49.5 49.5
Cash paid for income taxes, net of refunds received $ 187.1 $ 178.8