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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Operating Loss Carryforwards [Line Items]      
Net operating loss $ 1,084.8 $ 1,039.5  
R&D credit 89.1 81.9  
Unrecognized tax benefits 0.0 0.0 $ 0.0
Increase Adjustments, Capitalized Costs, Interest Disallowance, NOL's and Other      
Operating Loss Carryforwards [Line Items]      
Valuation allowance, deferred tax asset, increase (decrease), amount 0.2 46.8 73.7
Decrease Adjustments for Deductibility of Amounts Previously Capitalized, Derecognition of Certain Deferred Tax Assets      
Operating Loss Carryforwards [Line Items]      
Valuation allowance, deferred tax asset, increase (decrease), amount (27.1) (2.7) $ (3.7)
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 3,497.9 3,290.0  
R&D credit 87.1 79.4  
Federal | Tax Year 2034      
Operating Loss Carryforwards [Line Items]      
Net operating loss 58.3    
State and local      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 2,728.6 2,657.9  
Foreign      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 769.4 $ 771.6