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Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block] Intangible assets are presented below.
 
September 30,
 
2018
 
2017
 
(in millions)
Capitalized internal-use software:
 
 
 
Cost
$
27.6

 
$
28.4

Accumulated amortization
(14.2
)
 
(11.3
)
Net book value
13.4

 
17.1

 
 
 
 
Business combination-related:
 
 
 
Cost:
 
 
 
Finite-lived intangible assets:
 
 
 
Technology
82.6

 
76.7

Customer relationships and other
358.8

 
359.2

Indefinite-lived intangible assets:
 
 
 
Trade names and trademarks
266.6

 
266.8

Goodwill
12.1

 
12.9

 
720.1

 
715.6

Accumulated amortization:
 
 
 
Technology
(72.9
)
 
(72.2
)
Customer relationships and other
(240.4
)
 
(221.2
)
 
(313.3
)
 
(293.4
)
Net book value
406.8

 
422.2

Total intangible assets net book value
$
420.2

 
$
439.3