Note 12 - Notes Payable (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Debt [Table Text Block]

Date Issued	Amount Issued		Interest Rate		Maturity Date
Oct-23	$	500.0		6.400%	Mar-34
Aug-22	$	650.0		4.600%	Feb-33
Feb-22	$	600.0		3.200%	Apr-32

Date Paid	Amount Repaid		Interest Rate		Maturity Date
Sep-22 (1)	$	299.7		3.500%	Apr-23
Sep-22 (1) (2)	$	350.0		3.125%	Jun-23
Sep-22 (1) (2)	$	299.4		3.375%	Oct-22
Mar-22 (3)	$	500.0		3.400%	Nov-22

Notes Payable [Member]

Notes Tables

Schedule of Debt [Table Text Block]

	Carrying Amount at December 31,						Interest Rate at December 31,				Maturity Date at
	2023			2022			2023		2022		December 31, 2023
Senior unsecured notes	$	7,303.0		$	6,803.0			1.90% - 6.88%		1.90% - 6.88%	Jan-2024 – Oct-2049
Credit facility (1)		-			-			n/a		n/a	Mar-2027
Fair value debt adjustments, net		24.9			44.4			n/a		n/a		n/a
Deferred financing costs, net (2)		(65.0	)		(66.4	)		n/a		n/a		n/a
	$	7,262.9		$	6,781.0			3.66%*		3.45%*

Unsecured Debt [Member]

Notes Tables

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

	2024		2025		2026		2027		2028		Thereafter		Total
Principal payments	$	646.2	$	740.5	$	773.0	$	433.7	$	409.6	$	4,300.0	$	7,303.0