Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Sep. 30, 2022
Foreign Exchange Contract | Not Designated as Hedging Instrument
Liabilities, Fair Value Disclosure [Abstract]
Derivative, notional amount	$ 27.1	$ 150.5
Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivative, notional amount	275.0
Derivative, notional amount matured	75.0
Level 1
Other noncurrent assets
Total assets at fair value	20.8	0.4
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities at fair value	0.0	0.0
Level 2
Other noncurrent assets
Total assets at fair value	287.6	37.1
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities at fair value	0.1	5.2
NAV (a)
Other noncurrent assets
Total assets at fair value	2.8	6.4
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities at fair value	20.2	19.6
Fair Value, Measurements, Recurring
Prepaid Expense and Other Assets, Current [Abstract]
Currency derivatives	0.3	6.0
Other noncurrent assets
Non-qualified trust funds	2.8	6.4
Interest rate swap agreements	9.8	12.6
Deferred compensation investments	19.4
Total assets at fair value	311.2	43.9
Liabilities, Fair Value Disclosure [Abstract]
Currency derivatives	0.1	5.2
Deferred compensation obligations	20.2	19.6
Total liabilities at fair value	20.3	24.8
Fair Value, Measurements, Recurring | Money market funds
Cash and cash equivalents
Cash and cash equivalents	1.4	0.4
Fair Value, Measurements, Recurring | Time deposits
Cash and cash equivalents
Cash and cash equivalents	277.5	13.3
Fair Value, Measurements, Recurring | Prepaid expenses and other current assets
Other noncurrent assets
Interest rate swap agreements		5.2
Fair Value, Measurements, Recurring | Level 1
Other noncurrent assets
Deferred compensation investments	19.4
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Cash and cash equivalents
Cash and cash equivalents	1.4	0.4
Fair Value, Measurements, Recurring | Level 2
Prepaid Expense and Other Assets, Current [Abstract]
Currency derivatives	0.3	6.0
Other noncurrent assets
Non-qualified trust funds	0.0	0.0
Interest rate swap agreements	9.8	12.6
Liabilities, Fair Value Disclosure [Abstract]
Currency derivatives	0.1	5.2
Fair Value, Measurements, Recurring | Level 2 | Time deposits
Cash and cash equivalents
Cash and cash equivalents	277.5	13.3
Fair Value, Measurements, Recurring | Level 2 | Prepaid expenses and other current assets
Other noncurrent assets
Interest rate swap agreements		5.2
Fair Value, Measurements, Recurring | NAV (a)
Other noncurrent assets
Non-qualified trust funds	2.8	6.4
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation obligations	$ 20.2	$ 19.6