Fair Value Measurements and Derivatives Instruments (Tables)

6 Months Ended

Mar. 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 March 31, 2020 and September 30, 2019:

	March 31, 2020
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	9.3	$	9.3	$	—	$	—
Total assets	$	9.3	$	9.3	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	14.3	$	—	$	14.3	$	—
Fuel hedges		4.3		—		4.3		—
Other liabilities:
Interest rate swap contracts		3.7		—		3.7		—
Fuel hedges		0.9		—		0.9		—
Obligation to Rabbi Trust		9.3		9.3		—		—
Total liabilities	$	32.5	$	9.3	$	23.2	$	—

	September 30, 2019
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	11.1	$	11.1	$	—	$	—
Total assets	$	11.1	$	11.1	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	6.3	$	—	$	6.3	$	—
Other liabilities:
Interest rate swap contracts		10.9		—		10.9		—
Obligation to Rabbi Trust		11.1		11.1		—		—
Total liabilities	$	28.3	$	11.1	$	17.2	$	—

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 March 31,						Six Months Ended March 31,
	2020			2019			2020			2019
(Loss) recognized in Other comprehensive income (loss)	$	(8.1	)	$	(1.9	)	$	(7.9	)	$	(6.1	)
Net (loss) reclassified from Accumulated other comprehensive loss    into Interest expense		(3.8	)		(2.6	)		(6.8	)		(3.4	)

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 March 31,					Six Months Ended March 31,
	2020			2019		2020			2019
(Loss) income recognized in Other comprehensive income (loss)	$	(5.5	)	$	0.9	$	(5.5	)	$	0.9
Net (loss) income reclassified from Accumulated other    comprehensive loss into Interest expense		(0.1	)		—		0.2			—