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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
September 30, 2024September 30, 2023
TotalLevel 1Level 2TotalLevel 1Level 2
Assets:
Deferred compensation investments$16.3 $16.3 $— $13.0 $13.0 $— 
Derivative assets5.3 — 5.3 25.6 — 25.6 
Equity security investments
35.7 35.7 — 0.2 0.2 — 
$57.3 $52.0 $5.3 $38.8 $13.2 $25.6 
Liabilities:
Deferred compensation liabilities$49.9 $— $49.9 $36.8 $— $36.8 
Derivative liabilities14.8 — 14.8 16.1 — 16.1 
$64.7 $— $64.7 $52.9 $— $52.9