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Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024
Noncontrolling Interest [Line Items]
Balance at beginning of period		$ 1,321.8			$ 1,321.8
Net income (loss)	$ (158.4)		$ 42.8		(108.8)	$ 52.3
Net subscriptions (distributions) and other	38.4	13.1	63.1	$ 9.6
Net consolidations (deconsolidations)	(13.5)	4.7	(12.6)
Adjustment to fair value	(167.0)	1.5	(91.9)	(65.9)
Balance at End of Period	2,016.9				2,016.9
Minority Interests [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of period	639.5	634.0	523.2	446.0	634.0	446.0
Net income (loss)	9.0		10.1		19.7	22.5
Net subscriptions (distributions) and other	5.3		(14.8)		1.6	(15.9)
Net consolidations (deconsolidations)	0.0		0.0		0.0	0.0
Adjustment to fair value	167.0		91.9		165.5	157.8
Balance at End of Period	820.8	639.5	610.4	523.2	820.8	610.4
Acquisition	0.0		0.0		0.0	0.0
Redeemable Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of period	2,106.0	1,321.8	1,078.5	1,026.1	1,321.8	1,026.1
Net income (loss)	(158.4)		42.8		(108.8)	52.3
Net subscriptions (distributions) and other	(45.2)		(23.3)		126.7	13.7
Net consolidations (deconsolidations)	(52.5)		43.8		511.7	(16.2)
Adjustment to fair value	167.0		91.9		165.5	157.8
Balance at End of Period	2,016.9	2,106.0	1,253.9	1,078.5	2,016.9	1,253.9
Acquisition	0.0		20.2		0.0	20.2
Retained Earnings [Member]
Noncontrolling Interest [Line Items]
Adjustment to fair value	(167.0)	1.5	(91.9)	(65.9)
CIPs [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of period	1,466.5	687.8	555.3	580.1	687.8	580.1
Net income (loss)	(167.4)		32.7		(128.5)	29.8
Net subscriptions (distributions) and other	(50.5)		(8.5)		125.1	29.6
Net consolidations (deconsolidations)	(52.5)		43.8		511.7	(16.2)
Adjustment to fair value	0.0		0.0		0.0	0.0
Balance at End of Period	1,196.1	$ 1,466.5	643.5	$ 555.3	1,196.1	643.5
Acquisition	$ 0.0		$ 20.2		$ 0.0	$ 20.2

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