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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flows from Operating Activities    
Net Income $ 956.2 $ 855.2
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 21.2 23.3
Amortization of purchased intangibles 55.2 55.2
Depreciation and amortization 27.3 30.1
Net realized and unrealized (gains) losses on investments (2.6) (2.5)
Deferred income taxes (7.4) (7.4)
Change in:    
Accounts receivable (196.8) (93.4)
Other current assets 0.0 464.0
Other assets 16.5 (0.2)
Accounts payable 20.3 20.5
Income taxes payable 280.9 151.4
Other current liabilities (57.1) (605.3)
Other liabilities (2.8) (1.8)
Other 5.7 3.6
Net Cash Provided by (Used in) Operating Activities 1,116.6 892.7
Cash Flows from Investing Activities    
Proceeds from maturities of available-for-sale marketable securities 3.6 1.7
Purchases of available-for-sale marketable securities (3.0) (1.2)
Purchases of property, net (14.2) (19.8)
Investments in privately-held equity investments (2.4) (3.5)
Net Cash Used in Investing Activities (16.0) (22.8)
Cash Flows from Financing Activities    
Proceeds from debt, net of issuance costs 742.3 0.0
Repayment of debt (750.0) 0.0
Cash dividends (2,567.4) (2,328.4)
Change in performance bond and guaranty fund contributions 21,799.1 4,281.4
Employee taxes paid on restricted stock vesting (8.2) (12.3)
Other (4.4) (4.3)
Net Cash Provided by Financing Activities 19,211.4 1,936.4
Net change in cash, cash equivalents and restricted cash 20,312.0 2,806.3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning balance 101,794.1 93,109.7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, ending balance 122,106.1 95,916.0
Cash and cash equivalents 1,405.3 1,436.9
Short-term restricted cash 6.3 5.2
Long-term restricted cash 0.0  
Restricted cash and restricted cash equivalents (performance bonds and guaranty fund contributions) 120,694.5 94,473.9
Income taxes paid 12.7 114.8
Interest paid $ 41.1 $ 41.1