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Fair Value (Tables)
12 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value at September 30, 2020
 Carrying ValueLevel 1Level 2Level 3Total
 (in millions)
Cash and cash equivalents (a)
$394.3 $394.3 $— $— $394.3 
Debt (b)
641.1 — 673.5 — 673.5 
Fair Value at September 30, 2019
Carrying ValueLevel 1Level 2 Level 3Total
(in millions)
Cash and cash equivalents (a)
$382.8 $382.8 $ $ $382.8 
Debt (b)
460.5 — 497.3 — 497.3