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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net income $ 199.3 $ 194.1
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property and equipment 8.9 9.8
Stock-based compensation 17.5 15.1
Investment Income, Amortization of Discount (3.6) (7.0)
Other Noncash Income (Expense) (1.1) (1.0)
Changes in operating assets and liabilities    
Other assets 0.2 (4.1)
Other Liabilities 6.6 (8.0)
Deferred revenues 57.2 38.6
Deferred Income Taxes 4.1 17.8
Net cash provided by operating activities 291.3 257.3
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]    
Proceeds from maturities and sales of marketable securities 358.6 658.0
Purchases of marketable securities (35.2) (157.8)
Purchases of property and equipment (5.8) (3.8)
Net cash used in investing activities 317.6 496.4
Cash flows from financing activities:    
Repayments of Short-Term Debt, Maturing in Three Months or Less (500.0) 0.0
Proceeds from Debt, Net of Issuance Costs 493.9 0.0
Payments for Repurchase of Common Stock 241.7 269.9
Proceeds from employee stock purchase plans 7.9 8.3
Net cash used in financing activities (239.9) (261.6)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (0.3) (0.4)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 368.7 491.7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning of period 212.1 245.5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, end of period 580.8 737.2
Supplemental cash flow disclosures:    
Cash paid for interest 26.2 13.1
Cash paid for income taxes, net of refunds received $ 20.0 $ 16.1