Note 13 - Notes Payable (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Debt [Table Text Block]

Date Paid	Maturity Date	Amount Repaid		Interest Rate
Jul-2020 & Aug-2020 (1)	May-2021	$	484.9		3.20	%

Schedule of Debt Issuance [Table Text Block]

Date Issued	Maturity Date	Amount Issued		Interest Rate
Aug-2020	Mar-2028	$	400.0		1.90	%
Jul-2020 (1)	Oct-2030	$	500.0		2.70	%
Aug-2019	Oct-2049	$	350.0		3.70	%

Notes Payable [Member]

Notes Tables

Schedule of Debt [Table Text Block]

	Carrying Amount at December 31,						Interest Rate at December 31,						Maturity Date at
	2020			2019			2020			2019			December 31, 2020
Senior unsecured notes	$	5,100.0		$	4,684.9			1.90% - 4.45	%		2.70% - 4.45	%	Nov-2022– Oct 2049
Credit facility		-			200.0			(1	)		(2	)	Mar-2024
Deferred financing costs, net (3)		(55.8	)		(53.1	)		n/a			n/a		n/a
	$	5,044.2		$	4,831.8			3.33%*			3.46%*

Unsecured Debt [Member]

Notes Tables

Schedule of Maturities of Long-term Debt [Table Text Block]

	2021		2022		2023		2024		2025		Thereafter		Total
Principal payments	$	-	$	500.0	$	350.0	$	400.0	$	500.0	$	3,350.0	$	5,100.0