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Assets and Liabilities, at Fair Value - Additional Information (Details) $ in Millions	3 Months Ended				12 Months Ended
	Jun. 30, 2026 USD ($)	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Apr. 01, 2025 USD ($)	Feb. 28, 2025 USD ($)
LPM Group Limited
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent Consideration (EBITDA)									$ 37.5
Business acquisition, contingent consideration fair value	$ 6.8				$ 6.8				2.8
Increase (reduction) in contingent consideration liability					5.6	$ (1.2)	$ (0.4)
Pinehurst
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business acquisition, contingent consideration fair value	0.6				0.6	0.7			0.7
Increase (reduction) in contingent consideration liability					1.1	0.1
Contingent consideration required to pay upon certain achievement									$ 5.3
Contingent consideration payment, remitted due to sale of inventory	0.3	$ 1.0
AMS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business acquisition, contingent consideration fair value						$ 5.9		$ 5.9
Increase (reduction) in contingent consideration liability					2.8
Contingent consideration payment, remitted due to sale of inventory			$ 0.6	$ 2.4
AMS \| Upon Achievement of Financial Targets when Certain Inventory is Sold
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business acquisition, contingent consideration fair value								3.0
AMS \| Maximum \| Upon Achievement of Certain Performance Benchmarks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business acquisition, contingent consideration fair value								$ 9.0
Monex
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase (reduction) in contingent consideration liability					(4.8)
Other Liabilities \| AMS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business acquisition, contingent consideration fair value	$ 0.2				$ 0.2
EBITDA Volatility \| Level 3 \| LPM Group Limited
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.85				0.85
EBITDA Volatility \| Level 3 \| AMS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.75				0.75
Risk Free Interest Rate \| Level 3 \| LPM Group Limited
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.04				0.04
Risk Free Interest Rate \| Level 3 \| Pinehurst
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.041				0.041
Risk Free Interest Rate \| Level 3 \| AMS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.037				0.037
Risk Free Interest Rate \| Level 3 \| Monex
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.04				0.04
EBITDA Risk Premium \| Level 3 \| LPM Group Limited
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.105				0.105
EBITDA Risk Premium \| Level 3 \| AMS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.12				0.12
Pre-Tax Earnings Risk Premium \| Level 3 \| Pinehurst
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.202				0.202
Pre-Tax Earnings Risk Premium \| Level 3 \| Monex
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.163				0.163
Pre-Tax Earnings Volatility \| Level 3 \| Pinehurst
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.80				0.80
Pre-Tax Earnings Volatility \| Level 3 \| Monex
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	0.44				0.44