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Fair Value (Tables)
3 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value at December 31, 2023
 Carrying ValueLevel 1Level 2Level 3Total
 (in millions)
Cash and cash equivalents (a)
$458.9 $458.9 $— $— $458.9 
Debt (b) (c)
705.3 — 673.5 9.9 683.4 
Fair Value at September 30, 2023
Carrying ValueLevel 1Level 2 Level 3Total
(in millions)
Cash and cash equivalents (a)
$616.0 $616.0 $— $— $616.0 
Debt (b)
695.0 — 633.2 — 633.2