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

 
$
382.8

 
$

 
$

 
$
382.8

Debt (b)
460.5

 

 
497.3

 

 
497.3

 
 
 
Fair Value at September 30, 2018
 
Carrying Value
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(in millions)
Cash and cash equivalents (a)
$
318.8

 
$
318.8

 
$

 
$

 
$
318.8

Restricted cash (a)
16.2

 
16.2

 

 

 
16.2

Debt (b)
112.4

 

 
113.2

 

 
113.2