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Goodwill (Tables)
 3 Months Ended
Dec. 31, 2019
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
The carrying value of goodwill is allocated to the Company’s operating segments as follows:
(in millions)
December 31,
2019
 
September 30,
2019
Commercial Hedging
$
30.3

 
$
30.3

Global Payments
7.6

 
7.6

Securities
8.7

 
8.7

Physical Commodities
4.6

 
4.6

Clearing and Execution
4.3

 
—

Goodwill
$
55.5

 
$
51.2