Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			3 Months Ended
	Feb. 14, 2024	Apr. 30, 2024	Feb. 21, 2024	Dec. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Common Stock, Shares Authorized (in shares)				2,000,000,000	2,000,000,000
Share Price (in dollars per share)				$ 238.86	$ 235.73
Preferred Stock, Shares Authorized (in shares)					80,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001
Preferred Stock, Shares Issued (in shares)				0	0
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.39
Payments of Dividends					$ 55.8	$ 49.2
Treasury Stock, Shares, Acquired (in shares)					892,273	10,902,788
Treasury Stock, Common, Shares (in shares)				400,694,609	401,217,853
Common Stock Reissued (in shares)					368,729
Shares Issued, Price Per Share (in dollars per share)					$ 22.63
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)					254,861	1,399,406
Accelerated Share Repurchase ("ASR") Agreement [Member]
Stock Repurchase Program, Authorized Amount				$ 250.0
Treasury Stock, Shares, Acquired (in shares)			178,227	873,479
Shares Acquired, Average Cost Per Share (in dollars per share)			$ 237.71
Accelerated Share Repurchase ("ASR") Agreement With JPMorgan Chase Bank [Member]
Stock Repurchase Program, Authorized Amount					$ 200.0
Treasury Stock, Shares, Acquired (in shares)					714,046
Accelerated Share Repurchase ("ASR") Agreement With JPMorgan Chase Bank [Member] | Subsequent Event [Member]
Treasury Stock, Shares, Acquired (in shares)		148,286
Shares Acquired, Average Cost Per Share (in dollars per share)		$ 231.93
Share Repurchase Programs [Member]
Share Repurchase Program, Remaining Authorized, Amount					$ 1,441.5
Additonal Repurchase Authorization Shares Upon Sale of Energy Business [Member]
Stock Repurchase Program, Authorized Amount	$ 1,000.0
Sales and Excise Tax Payable					$ 26.4