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Note 16 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions													1 Months Ended						12 Months Ended
	Dec. 31, 2020	Oct. 28, 2020	Oct. 01, 2020	Sep. 30, 2020	Jul. 29, 2020	Jul. 01, 2020	Jun. 30, 2020	Apr. 29, 2020	Apr. 01, 2020	Mar. 31, 2020	Feb. 12, 2020	Jan. 02, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Feb. 28, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock, Shares Authorized (in shares)	2,000,000,000												2,000,000,000					2,000,000,000	2,000,000,000	2,000,000,000
Preferred Stock, Shares Authorized (in shares)	80,000,000												80,000,000						80,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001												$ 0.001						$ 0.001
Preferred Stock, Shares Issued, Total (in shares)	0												0						0
Share Price (in dollars per share)	$ 207.59												$ 207.59					$ 149.34	$ 207.59	$ 149.34	$ 108.28
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.27			$ 0.27			$ 0.27			$ 0.27
Payments of Dividends, Total	$ 43.9			$ 43.9			$ 44.0			$ 43.9									$ 175.8	$ 163.5	$ (0.0)
Accelerated Share Repurchases, Initial Price, Shares (in shares)																			1,339,462
Treasury Stock, Shares, Ending Balance (in shares)	381,185,512												381,185,512					380,841,474	381,185,512	380,841,474
Common Stock Reissued (in shares)																			1,811,046	1,369,305	2,973,947
Common Stock, Weighted Average Price (in dollars per share)	$ 10.67												$ 10.67					$ 9.72	$ 10.67	$ 9.72	$ 8.71
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)																			513,137	674,983	496,446
May 2010 Share Repurchase Program [Member] | Common Stock [Member]
Stock Repurchase Program, Authorized Amount	$ 3,800.0												$ 3,800.0						$ 3,800.0
February 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Initial Price, Shares (in shares)																	40,901
February 2020 Share Repurchase Program [Member] | Common Stock [Member]
Stock Repurchase Program, Authorized Amount											$ 500.0
Share Repurchase Programs [Member]
Treasury Stock, Cumulative Value Acquired, Cost Method	3,521.2												3,521.2						3,521.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 278.8												$ 278.8						$ 278.8
Accelerated Share Repurchases, Initial Price, Shares (in shares)																			2,155,084	2,178,151
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)																			$ 161.84	$ 137.73
Treasury Stock, Shares, Ending Balance (in shares)	381,185,512												381,185,512						381,185,512
December 2019 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price																		$ 50.0
March 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price																$ 75.0
June 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price															$ 50.0
Accelerated Share Repurchases, Initial Price, Shares (in shares)															61,052
September 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price														$ 50.0
Accelerated Share Repurchases, Initial Price, Shares (in shares)														41,272
January 2, 2020 [Member]
Accelerated Share Repurchases, Initial Price, Shares (in shares)												267,845
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)												$ 149.34
April 1, 2020 [Member]
Accelerated Share Repurchases, Initial Price, Shares (in shares)									430,477
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)									$ 139.38
July 1, 2020 [Member]
Accelerated Share Repurchases, Initial Price, Shares (in shares)						235,018
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)						$ 170.20
October 1, 2020 [Member]
Accelerated Share Repurchases, Initial Price, Shares (in shares)			215,855
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)			$ 185.31
December 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price													$ 50.0
Accelerated Share Repurchases, Initial Price, Shares (in shares)													47,042

X

- Definition

The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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