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Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025
Other noncurrent assets
Non-qualified trust funds	$ 4.2	$ 2.2
Deferred compensation investments	19.1	19.2
Total assets at fair value	26.3	24.8
Other noncurrent liabilities
Deferred compensation obligations	19.8	20.4
Total liabilities at fair value	19.8	20.4
Money market funds
Cash and cash equivalents
Cash and cash equivalents	0.3	0.8
Time deposits
Cash and cash equivalents
Cash and cash equivalents	2.7	2.6
Level 1
Other noncurrent assets
Non-qualified trust funds	0.0	0.0
Deferred compensation investments	19.1	19.2
Total assets at fair value	19.4	20.0
Other noncurrent liabilities
Deferred compensation obligations	0.0	0.0
Total liabilities at fair value	0.0	0.0
Level 1 | Money market funds
Cash and cash equivalents
Cash and cash equivalents	0.3	0.8
Level 1 | Time deposits
Cash and cash equivalents
Cash and cash equivalents	0.0	0.0
Level 2
Other noncurrent assets
Non-qualified trust funds	0.0	0.0
Deferred compensation investments	0.0	0.0
Total assets at fair value	2.7	2.6
Other noncurrent liabilities
Deferred compensation obligations	0.0	0.0
Total liabilities at fair value	0.0	0.0
Level 2 | Money market funds
Cash and cash equivalents
Cash and cash equivalents	0.0	0.0
Level 2 | Time deposits
Cash and cash equivalents
Cash and cash equivalents	2.7	2.6
Level 3
Other noncurrent assets
Non-qualified trust funds	0.0	0.0
Deferred compensation investments	0.0	0.0
Total assets at fair value	0.0	0.0
Other noncurrent liabilities
Deferred compensation obligations	0.0	0.0
Total liabilities at fair value	0.0	0.0
Level 3 | Money market funds
Cash and cash equivalents
Cash and cash equivalents	0.0	0.0
Level 3 | Time deposits
Cash and cash equivalents
Cash and cash equivalents	0.0	0.0
NAV
Other noncurrent assets
Non-qualified trust funds	4.2	2.2
Total assets at fair value	4.2	2.2
Other noncurrent liabilities
Deferred compensation obligations	19.8	20.4
Total liabilities at fair value	$ 19.8	$ 20.4

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