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Goodwill - Goodwill by Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Goodwill [Line Items]    
Remaining excess allocated to goodwill $ 54.7 $ 51.2
Commercial [Member]    
Goodwill [Line Items]    
Remaining excess allocated to goodwill 32.7 32.7
Institutional [Member]    
Goodwill [Line Items]    
Remaining excess allocated to goodwill 9.8 8.7
Retail [Member]    
Goodwill [Line Items]    
Remaining excess allocated to goodwill 2.2 2.2
Global Payments [Member]    
Goodwill [Line Items]    
Remaining excess allocated to goodwill $ 10.0 $ 7.6