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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash Flows from Operating Activities    
Net Income $ 855.2 $ 883.8
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 23.3 20.2
Amortization of purchased intangibles 55.2 56.8
Depreciation and amortization 30.1 31.9
Net realized and unrealized (gains) losses on investments (2.5) (74.8)
Deferred income taxes (7.4) (8.7)
Change in:    
Accounts receivable (93.4) (241.2)
Other current assets 464.0 54.7
Other assets (0.2) 19.4
Accounts payable 20.5 (24.2)
Income taxes payable 151.4 282.5
Other current liabilities (605.3) (106.7)
Other liabilities (1.8) (7.2)
Other 3.6 15.9
Net Cash Provided by (Used in) Operating Activities 892.7 902.4
Cash Flows from Investing Activities    
Proceeds from maturities of available-for-sale marketable securities 1.7 0.7
Purchases of available-for-sale marketable securities (1.2) (0.3)
Purchases of property, net (19.8) (15.2)
Investments in privately-held equity investments (3.5) (2.4)
Net Cash Used in Investing Activities (22.8) (17.2)
Cash Flows from Financing Activities    
Cash dividends (2,328.4) (2,035.6)
Change in performance bond and guaranty fund contributions 4,281.4 (7,158.5)
Employee taxes paid on restricted stock vesting (12.3) (0.3)
Other (4.3) (4.1)
Net Cash Provided by (Used in) Financing Activities 1,936.4 (9,198.5)
Net change in cash, cash equivalents and restricted cash 2,806.3 (8,313.3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning balance 93,109.7 137,974.3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, ending balance 95,916.0 129,661.0
Cash and cash equivalents 1,436.9 1,565.2
Short-term restricted cash 5.2 5.1
Long-term restricted cash 0.0  
Restricted cash and restricted cash equivalents (performance bonds and guaranty fund contributions) 94,473.9 128,090.7
Income taxes paid 114.8 30.9
Interest paid 41.1 41.1
AccruedProceedsfromSaleofInvestment $ 0.0 $ 97.9