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Fair Value (Tables)
12 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value at September 30, 2022
 Carrying ValueLevel 1Level 2Level 3Total
 (in millions)
Cash and cash equivalents (a)
$264.8 $264.8 $— $— $264.8 
Debt (b) (c)
706.0 — 570.7 12.5 583.2 
Fair Value at September 30, 2021
Carrying ValueLevel 1Level 2 Level 3Total
(in millions)
Cash and cash equivalents (a)
$153.6 $153.6 $— $— $153.6 
Debt (b) (c)
704.5 — 711.2 12.5 723.7