Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Millions		Sep. 30, 2025	Sep. 30, 2024
Operating Lease Liability, Payment Due [Abstract]
2026		$ 28.2
2027		21.3
2028		15.5
2029		10.2
2030		6.0
Thereafter		6.9
Total net lease payments		88.1
Less: Amounts representing interest		(9.9)
Total operating lease liabilities		78.2	$ 87.5
Less: Current portion of lease liabilities		(24.7)	(24.9)
Non-current lease liabilities		53.5	62.6
Finance Lease Liability, Payment Due [Abstract]
2026		48.0
2027		21.8
2028		8.1
2029		6.1
2030		3.1
Thereafter		0.0
Total net lease payments		87.1
Less: Amounts representing interest		(5.2)
Total finance lease liabilities		81.9	68.2
Less: Current portion of lease liabilities	[1]	(44.8)	(37.0)
Non-current lease liabilities	[2]	$ 37.1	$ 31.2

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

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