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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
	Sep. 15, 2020	Jul. 29, 2020	Jul. 01, 2020	Jun. 15, 2020	Apr. 29, 2020	Apr. 01, 2020	Mar. 31, 2020	Feb. 12, 2020	Jan. 02, 2020	Sep. 30, 2019	Jun. 28, 2019	Mar. 29, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 30, 2020
Common Stock, Shares Authorized (in shares)													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)													$ 185.31				$ 148.61	$ 185.31		$ 185.31
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.27			$ 0.27			$ 0.27		$ 0.25	$ 0.25	$ 0.25
Payments of Dividends, Total	$ 43.9			$ 44.0			$ 43.9			$ 40.8	$ 41.0	$ 40.9						$ 43.9	$ 40.8	$ 131.8	$ 122.7
Accelerated Share Repurchases, Initial Price, Shares (in shares)																				1,076,565
Treasury Stock, Value, Acquired, Cost Method																		$ 50.0	$ 75.0	$ 298.8	$ 200.0
Treasury Stock, Shares, Ending Balance (in shares)													381,251,589				380,841,474	381,251,589		381,251,589
Common Stock Reissued (in shares)																				1,482,072
Common Stock, Weighted Average Price (in dollars per share)													$ 10.61					$ 10.61		$ 10.61
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)																		40,741	870,606	675,324	606,100
Common Stock [Member]
Treasury Stock, Value, Acquired, Cost Method																		$ (0.0)	$ (0.0)	$ (0.0)	$ (0.0)
May 2010 Share Repurchase Program [Member] | Common Stock [Member]
Stock Repurchase Program, Authorized Amount																						$ 3,800.0
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													$ 3,471.2					3,471.2		3,471.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount													328.8					$ 328.8		$ 328.8
Accelerated Share Repurchases, Initial Price, Shares (in shares)																				1,892,187
Treasury Stock, Value, Acquired, Cost Method																				$ 298.8
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)																				$ 157.90
December 2019 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price																	$ 50.0
Accelerated Share Repurchases, Initial Price, Shares (in shares)									267,845							40,901
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)									$ 149.34
March 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price															$ 75.0
Accelerated Share Repurchases, Initial Price, Shares (in shares)			235,018			430,477								61,052
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)						$ 139.38
June 2020 Share Repurchase Program [Member]
Accelerated Share Repurchases, Purchase Price													$ 50.0	$ 50.0
Accelerated Share Repurchases, Initial Price, Shares (in shares)													41,272
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share)			$ 170.20

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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Aggregate dividends declared during the period for each share of common stock outstanding.

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