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Note 14 - Earnings and Dividends Per Share (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		*Three months ended*								*Nine months ended*
		*September 30,*								*September 30,*
		*2025*				*2024*				*2025*				*2024*
Net income attributable to JHG		$	142.1			$	27.3			$	412.7			$	287.1
Allocation of earnings to participating stock-based awards			(3.3	)			(0.7	)			(8.9	)			(6.8	)
Net income attributable to JHG common shareholders		$	138.8			$	26.6			$	403.8			$	280.3

Weighted-average common shares outstanding — basic			150.6				154.4				152.8				155.8
Dilutive effect of nonparticipating stock-based awards			0.7				0.3				0.6				0.2
Weighted-average common shares outstanding — diluted			151.3				154.7				153.4				156.0

Earnings per share:
Basic		$	0.92			$	0.17			$	2.64			$	1.80
Diluted		$	0.92			$	0.17			$	2.63			$	1.80

Dividends Declared [Table Text Block]

*Dividend*			*Date*		*Dividends paid*			*Date*
*per share*			*declared*		*(in millions)*			*paid*
$	0.39		January 30, 2025		$	61.5		February 27, 2025
$	0.40		April 30, 2025		$	63.8		May 29, 2025
$	0.40		July 30, 2025		$	62.4		August 28, 2025