Derivative Financial Instruments and Fair Value Measurements - Schedule of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Derivative [Line Items]
Credit facility investment	$ 17.4	$ 21.9
Contingent Consideration	(7.5)
Equity investment	21.9	19.4
Total net assets at fair value	46.2	62.5
Other current assets
Derivative [Line Items]
Derivative asset	$ 9.0	$ 9.2
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Other non-current assets
Derivative [Line Items]
Derivative asset	$ 10.0	$ 16.5
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT ASSETS	OTHER NON-CURRENT ASSETS
Other current liabilities
Derivative [Line Items]
Derivative liability	$ 1.8	$ 0.9
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Other non-current liabilities
Derivative [Line Items]
Derivative liability	$ 2.8	$ 3.6
Derivative Liability, Current, 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
Equity investment	21.9	19.4
Total net assets at fair value	21.9	19.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other current assets
Derivative [Line Items]
Derivative asset	$ 0.0	$ 0.0
Derivative Asset, Current, 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) | Other non-current assets
Derivative [Line Items]
Derivative asset	$ 0.0	$ 0.0
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT ASSETS	OTHER NON-CURRENT ASSETS
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other current liabilities
Derivative [Line Items]
Derivative liability	$ 0.0	$ 0.0
Derivative Liability, Current, 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) | Other non-current liabilities
Derivative [Line Items]
Derivative liability	$ 0.0	$ 0.0
Derivative Liability, Current, 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	(7.5)
Equity investment	0.0	0.0
Total net assets at fair value	6.9	21.2
Significant Observable Inputs (Level 2) | Other current assets
Derivative [Line Items]
Derivative asset	$ 9.0	$ 9.2
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Significant Observable Inputs (Level 2) | Other non-current assets
Derivative [Line Items]
Derivative asset	$ 10.0	$ 16.5
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT ASSETS	OTHER NON-CURRENT ASSETS
Significant Observable Inputs (Level 2) | Other current liabilities
Derivative [Line Items]
Derivative liability	$ 1.8	$ 0.9
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Significant Observable Inputs (Level 2) | Other non-current liabilities
Derivative [Line Items]
Derivative liability	$ 2.8	$ 3.6
Derivative Liability, Current, 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	$ 17.4	$ 21.9
Contingent Consideration	0.0
Equity investment	0.0	0.0
Total net assets at fair value	17.4	21.9
Significant Unobservable Inputs (Level 3) | Other current assets
Derivative [Line Items]
Derivative asset	$ 0.0	$ 0.0
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Significant Unobservable Inputs (Level 3) | Other non-current assets
Derivative [Line Items]
Derivative asset	$ 0.0	$ 0.0
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT ASSETS	OTHER NON-CURRENT ASSETS
Significant Unobservable Inputs (Level 3) | Other current liabilities
Derivative [Line Items]
Derivative liability	$ 0.0	$ 0.0
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Significant Unobservable Inputs (Level 3) | Other non-current liabilities
Derivative [Line Items]
Derivative liability	$ 0.0	$ 0.0
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	OTHER LONG-TERM LIABILITIES	OTHER LONG-TERM LIABILITIES