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Assets and Liabilities, at Fair Value - Summary of Acquisition-related Contingent Consideration (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2026 USD ($)	Jun. 30, 2026 USD ($)	Jan. 31, 2026 USD ($)	Apr. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)
LPM
Business Combination, Contingent Consideration [Line Items]
Maximum potential payment	$ 37.5
Acquisition-related contingent consideration	7.9				$ 2.8
Increase (reduction) reflected in earnings	1.2
Pinehurst
Business Combination, Contingent Consideration [Line Items]
Maximum potential payment	5.3
Contingent Consideration Payments Made		$ 1.3
Acquisition-related contingent consideration	1.3				$ 0.7
Increase (reduction) reflected in earnings	0.7
AMS
Business Combination, Contingent Consideration [Line Items]
Maximum potential payment	12.0
Contingent Consideration Payments Made		$ 3.0
Acquisition-related contingent consideration	0.2			$ 5.9
Increase (reduction) reflected in earnings	0.0
Monex
Business Combination, Contingent Consideration [Line Items]
Maximum potential payment	20.0
Acquisition-related contingent consideration	0.4		$ 5.2
Increase (reduction) reflected in earnings	0.0
Upon Achievement of Certain Performance Benchmarks \| AMS
Business Combination, Contingent Consideration [Line Items]
Maximum potential payment	9.0
Upon Achievement of Financial Targets when Certain Inventory is Sold \| AMS \| Maximum
Business Combination, Contingent Consideration [Line Items]
Maximum potential payment	$ 3.0
EBITDA Risk Premium \| LPM
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.105
EBITDA Risk Premium \| AMS
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.12
EBITDA Volatility \| LPM
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.85
EBITDA Volatility \| Pinehurst
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.80
EBITDA Volatility \| AMS
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.75
Risk Free Interest Rate \| LPM
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.042
Risk Free Interest Rate \| Pinehurst
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.046
Risk Free Interest Rate \| AMS
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.037
Risk Free Interest Rate \| Monex
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.04
Pre-Tax Earnings Risk Premium \| Pinehurst
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.203
Pre-Tax Earnings Risk Premium \| Monex
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.163
Pre Tax Net Income Volatility \| Monex
Business Combination, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.44