Fair Value Measurements and Derivative Instruments (Tables)

12 Months Ended

Sep. 30, 2019

Derivative Instruments Gain Loss [Line Items]

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

The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2019 and September 30, 2018:

	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	$	—

	September 30, 2018
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	12.5	$	12.5	$	—	$	—
Total Assets	$	12.5	$	12.5	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	3.4	$	—	$	3.4	$	—
Other liabilities:
Interest rate swap contracts		12.1		—		12.1		—
Obligation to Rabbi Trust		12.5		12.5		—		—
Total Liabilities	$	28.0	$	12.5	$	15.5	$	—

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:

	Fiscal Year Ended			Fiscal Year Ended			Nine Months Ended
	September 30, 2019			September 30, 2018			September 30, 2017
(Loss) income recognized in Other comprehensive    income (loss)	$	(10.2	)	$	9.8		$	(3.4	)
Net loss reclassified from Accumulated other    comprehensive loss into Interest expense		(8.1	)		(9.8	)		(7.4	)