Fair Value Measurements and Derivative Instruments (Tables)

3 Months Ended

Dec. 31, 2020

Derivative Instruments Gain Loss [Line Items]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables summarize the financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 and September 30, 2020:

	December 31, 2020
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	12.9	$	12.9	$	—	$	—
Fuel hedges		1.0		—		1.0		—
Total assets	$	13.9	$	12.9	$	1.0	$	—
Other liabilities:
Interest rate swap contracts	$	5.7	$	—	$	5.7	$	—
Obligation to Rabbi Trust		12.9		12.9		—		—
Total liabilities	$	18.6	$	12.9	$	5.7	$	—

	September 30, 2020
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	11.4	$	11.4	$	—	$	—
Fuel hedges		0.7		—		0.7		—
Total assets	$	12.1	$	11.4	$	0.7	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	4.5	$	—	$	4.5	$	—
Fuel hedges		0.8		—		0.8		—
Other liabilities:
Interest rate swap contracts		5.5		—		5.5		—
Obligation to Rabbi Trust		11.4		11.4		—		—
Total liabilities	$	22.2	$	11.4	$	10.8	$	—

Interest Rate Swaps

Derivative Instruments Gain Loss [Line Items]

Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges

The effects on the consolidated financial statements of the interest rate swaps which were designated as cash flow hedges were as follows:

	Three Months Ended December 31,
	2020			2019
(Loss) income recognized in Other comprehensive income (loss)	$	(0.2	)	$	0.2
Net (loss) reclassified from Accumulated other comprehensive    income (loss) into Interest expense		(4.2	)		(3.0	)

Fuel Swap Contracts

Derivative Instruments Gain Loss [Line Items]

Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges

The effects on the consolidated financial statements of the fuel swaps which were designated as cash flow hedges were as follows:

	Three Months Ended December 31,
	2020			2019
Income (loss) recognized in Other comprehensive income (loss)	$	0.2		$	0.1
Net (loss) income reclassified from Accumulated other    comprehensive income (loss) into Cost of services provided		(0.8	)		0.4