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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended			3 Months Ended					9 Months Ended
	Aug. 31, 2024	Jun. 13, 2024	Mar. 13, 2024	Dec. 14, 2023	Jul. 31, 2024	Apr. 30, 2024	Feb. 29, 2024	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Common Stock, Shares Authorized (in shares)									2,000,000,000				2,000,000,000		2,000,000,000
Share Price (in dollars per share)									$ 267.96				$ 267.96		$ 238.86
Preferred Stock, Shares Authorized (in shares)									80,000,000				80,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)									$ 0.001				$ 0.001
Preferred Stock, Shares Issued (in shares)									0				0		0
Common Stock, Dividends, Per Share, Declared (in dollars per share)									$ 0.39	$ 0.39	$ 0.39
Payments of Dividends									$ 55.3			$ 49.2	$ 166.6	$ 147.9
Treasury Stock, Shares, Acquired (in shares)												208,422	2,895,946	11,111,210
Sales and Excise Tax Payable									$ 30.0				$ 30.0
Treasury Stock, Common, Shares (in shares)									402,606,293				402,606,293		400,694,309
Common Stock Reissued (in shares)													983,962
Shares Issued, Price Per Share (in dollars per share)									$ 23.25				$ 23.25
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)									202,684			89,792	237,062	716,783
Accelerated Share Repurchase ("ASR") Agreement [Member]
Share Repurchase Program, Authorized, Amount	$ 400.0									$ 150.0	$ 200.0				$ 250.0
Treasury Stock, Shares, Acquired (in shares)	212,635	483,761	714,046	873,479			178,227
Shares Acquired, Average Cost Per Share (in dollars per share)	$ 263.92
Treasury Stock, Shares, Acquired, Initial Delivery (in shares)	1,302,981
Share Repurchase Program, Remaining Authorized, Amount									$ 891.5				$ 891.5
Accelerated Share Repurchase ("ASR") Agreement With JPMorgan Chase Bank [Member]
Treasury Stock, Shares, Acquired (in shares)					68,645	148,286
Shares Acquired, Average Cost Per Share (in dollars per share)						$ 231.93	$ 237.71
The June 2024 ASR Agreement [Member]
Shares Acquired, Average Cost Per Share (in dollars per share)					$ 271.54
Forecast [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)								$ 0.39