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Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value (Details) - Fair Value Measurement, Recurring - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Other noncurrent assets
Total assets at fair value	$ 24.8	$ 27.8
Other noncurrent liabilities
Deferred compensation obligations	20.4	22.3
Total liabilities at fair value	20.4	22.3
Level 1
Other noncurrent assets
Total assets at fair value	20.0	23.3
Other noncurrent liabilities
Total liabilities at fair value	0.0	0.0
Level 2
Other noncurrent assets
Total assets at fair value	2.6	2.6
Other noncurrent liabilities
Total liabilities at fair value	0.0	0.0
Assets measured at NAV
Other noncurrent assets
Total assets at fair value	2.2	1.9
Other noncurrent liabilities
Deferred compensation obligations	20.4	22.3
Total liabilities at fair value	20.4	22.3
Money market funds
Cash and cash equivalents
Cash and cash equivalents	0.8	0.3
Money market funds | Level 1
Cash and cash equivalents
Cash and cash equivalents	0.8	0.3
Time deposits
Cash and cash equivalents
Cash and cash equivalents	2.6	2.6
Time deposits | Level 2
Cash and cash equivalents
Cash and cash equivalents	2.6	2.6
Other noncurrent assets
Other noncurrent assets
Non-qualified trust funds	2.2	1.9
Deferred compensation investments	19.2	23.0
Other noncurrent assets | Level 1
Other noncurrent assets
Deferred compensation investments	19.2	23.0
Other noncurrent assets | Assets measured at NAV
Other noncurrent assets
Non-qualified trust funds	$ 2.2	$ 1.9

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