v3.26.1
Derivative Financial Instruments and Fair Value Measurements - Schedule of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Derivative [Line Items]    
Credit facility investment $ 30.7 $ 17.4
Contingent Consideration 0.9  
Contingent Consideration   (7.5)
Equity investment 31.0 21.9
Total net assets at fair value 78.8 46.2
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivative [Line Items]    
Derivative Asset $ 10.4 $ 9.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative [Line Items]    
Derivative Asset $ 7.3 $ 10.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] OTHER NON-CURRENT ASSETS OTHER NON-CURRENT ASSETS
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent    
Derivative [Line Items]    
Derivative Liability $ (1.1) $ (1.8)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other current liabilities Accrued expenses and other current liabilities
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative [Line Items]    
Derivative Liability $ (0.4) $ (2.8)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Credit facility investment $ 0.0 $ 0.0
Contingent Consideration 0.0  
Contingent Consideration   0.0
Equity investment 31.0 21.9
Total net assets at fair value 31.0 21.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivative [Line Items]    
Derivative Asset $ 0.0 $ 0.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current
Quoted Prices in Active Markets for Identical Assets (Level 1) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative [Line Items]    
Derivative Asset $ 0.0 $ 0.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] OTHER NON-CURRENT ASSETS OTHER NON-CURRENT ASSETS
Quoted Prices in Active Markets for Identical Assets (Level 1) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent    
Derivative [Line Items]    
Derivative Liability $ 0.0 $ 0.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other current liabilities Accrued expenses and other current liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative [Line Items]    
Derivative Liability $ 0.0 $ 0.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES
Significant Observable Inputs (Level 2)    
Derivative [Line Items]    
Credit facility investment $ 0.0 $ 0.0
Contingent Consideration 0.9  
Contingent Consideration   (7.5)
Equity investment 0.0 0.0
Total net assets at fair value 17.1 6.9
Significant Observable Inputs (Level 2) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivative [Line Items]    
Derivative Asset $ 10.4 $ 9.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current
Significant Observable Inputs (Level 2) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative [Line Items]    
Derivative Asset $ 7.3 $ 10.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] OTHER NON-CURRENT ASSETS OTHER NON-CURRENT ASSETS
Significant Observable Inputs (Level 2) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent    
Derivative [Line Items]    
Derivative Liability $ (1.1) $ (1.8)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other current liabilities Accrued expenses and other current liabilities
Significant Observable Inputs (Level 2) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative [Line Items]    
Derivative Liability $ (0.4) $ (2.8)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES
Significant Unobservable Inputs (Level 3)    
Derivative [Line Items]    
Credit facility investment $ 30.7 $ 17.4
Contingent Consideration 0.0  
Contingent Consideration   0.0
Equity investment 0.0 0.0
Total net assets at fair value 30.7 17.4
Significant Unobservable Inputs (Level 3) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivative [Line Items]    
Derivative Asset $ 0.0 $ 0.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current
Significant Unobservable Inputs (Level 3) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative [Line Items]    
Derivative Asset $ 0.0 $ 0.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] OTHER NON-CURRENT ASSETS OTHER NON-CURRENT ASSETS
Significant Unobservable Inputs (Level 3) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent    
Derivative [Line Items]    
Derivative Liability $ 0.0 $ 0.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other current liabilities Accrued expenses and other current liabilities
Significant Unobservable Inputs (Level 3) | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative [Line Items]    
Derivative Liability $ 0.0 $ 0.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES