Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Millions		Sep. 30, 2021	Sep. 30, 2020
Operating Lease Liability, Payment Due [Abstract]
2022		$ 24.1
2023		19.3
2024		13.8
2025		8.4
2026		5.6
Thereafter		12.4
Total		83.6
Less: Executory Costs		0.0
Total net lease payments		83.6
Less: Amounts representing interest		7.4
Total operating lease liabilities		76.2	$ 65.8
Less: Current portion of lease liabilities		(22.0)	(18.3)
Operating Lease Liability Noncurrent		54.2	47.5
Finance Lease Liability, Payment Due [Abstract]
2022		15.0
2023		7.0
2024		3.9
2025		2.4
2026		1.2
Thereafter		0.2
Total		29.7
Less: Executory Costs		0.0
Total net lease payments		29.7
Less: Amounts representing interest		2.1
Total finance lease liabilities		27.6	18.7
Less: Current portion of lease liabilities	[1]	(14.9)	(4.1)
Non-current lease liabilities	[2]	$ 12.7	$ 14.6

[1] Included in “Accrued expenses and other liabilities” in the consolidated balance sheet.

[2] Included in “Other liabilities” in the consolidated balance sheet.