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Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2025	Jun. 30, 2024
Noncontrolling Interest [Line Items]
Balance at beginning of period			$ 1,321.8				$ 1,321.8
Net income (loss)	$ 20.0			$ 43.0			(88.8)	$ 95.3
Net subscriptions (distributions) and other	28.1	$ 38.4	13.1	29.4	$ 63.1	$ 9.6
Net deconsolidations	2.9	(13.5)	4.7		(12.6)
Adjustment to fair value	(41.0)	(167.0)	1.5	48.9	(91.9)	(65.9)
Balance at End of Period	1,380.5						1,380.5
Minority Interests [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of period	820.8		634.0	610.4		446.0	634.0	446.0
Net income (loss)	11.0			12.2			30.7	34.7
Net subscriptions (distributions) and other	(33.4)			(26.8)			(31.8)	(42.7)
Net deconsolidations	0.0			0.0			0.0	0.0
Adjustment to fair value	41.0			(48.9)			206.5	108.9
Balance at End of Period	839.4	820.8		546.9	610.4		839.4	546.9
Acquisition							0.0	0.0
Redeemable Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of period	2,016.9		1,321.8	1,253.9		1,026.1	1,321.8	1,026.1
Net income (loss)	20.0			43.0			(88.8)	95.3
Net subscriptions (distributions) and other	(11.3)			115.5			115.4	129.2
Net deconsolidations	(686.1)			(97.3)			(174.4)	(113.5)
Adjustment to fair value	41.0			(48.9)			206.5	108.9
Balance at End of Period	1,380.5	2,016.9		1,266.2	1,253.9		1,380.5	1,266.2
Acquisition							0.0	20.2
Retained Earnings [Member]
Noncontrolling Interest [Line Items]
Adjustment to fair value	(41.0)	(167.0)	1.5	48.9	(91.9)	(65.9)
CIPs [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of period	1,196.1		$ 687.8	643.5		$ 580.1	687.8	580.1
Net income (loss)	9.0			30.8			(119.5)	60.6
Net subscriptions (distributions) and other	22.1			142.3			147.2	171.9
Net deconsolidations	(686.1)			(97.3)			(174.4)	(113.5)
Adjustment to fair value	0.0			0.0			0.0	0.0
Balance at End of Period	$ 541.1	$ 1,196.1		$ 719.3	$ 643.5		541.1	719.3
Acquisition							$ 0.0	$ 20.2

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