Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Millions		Sep. 30, 2024	Sep. 30, 2023
Operating Lease Liability, Payment Due [Abstract]
2025		$ 28.5
2026		23.4
2027		16.7
2028		11.5
2029		7.2
Thereafter		10.7
Total net lease payments		98.0
Less: Amounts representing interest		(10.5)
Total operating lease liabilities		87.5	$ 92.4
Less: Current portion of lease liabilities		(24.9)	(27.3)
Non-current lease liabilities		62.6	65.1
Finance Lease Liability, Payment Due [Abstract]
2025		40.0
2026		21.3
2027		7.1
2028		3.2
2029		1.3
Thereafter		0.2
Total net lease payments		73.1
Less: Amounts representing interest		(4.9)
Total finance lease liabilities		68.2	42.8
Less: Current portion of lease liabilities	[1]	(37.0)	(21.5)
Non-current lease liabilities	[2]	$ 31.2	$ 21.3

[1] Included in “Accrued expenses and other liabilities” in the Consolidated Balance Sheets.

[2] Included in “Other liabilities” in the Consolidated Balance Sheets.