Derivative Instruments and Hedging Activity (Tables)

12 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The estimated fair values of our derivative instruments are described in the table below:

Derivative Instruments	September 30, 2020		Consolidated Balance Sheet Classification	September 30, 2019		Consolidated Balance Sheet Classification
Interest Rate Swaps	$	—	Other assets	$	0.9	Other assets
Interest Rate Swaps	(46.3)		Other current liabilities	(7.7)		Other current liabilities
Currency Exchange Contracts	(0.4)		Other current liabilities	0.2		Other current assets
Cross-Currency Swaps	9.7		Other assets	16.9		Other assets
Undesignated Forward Contracts	$	—	Other assets	(0.2)		Other current liabilities
Total	$	(37.0)		$	10.1

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location

The following table summarizes unrealized and realized gains and losses for forward contracts not designated as hedges, which are recorded in Investment income (expense) and other, net.

	Year Ended September 30
	2020		2019
Unrealized gains (losses)	$	—	$	(0.2)
Realized gains (losses)	3.0		(2.9)