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Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2019
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
Changes in the carrying amount of goodwill were as follows:
 
2019
 
(in millions)
Balance at beginning of year
$
12.1

Acquisition of Krausz
80.1

Change in foreign currency exchange rates
3.5

Balance at end of year
$
95.7
Schedule of Intangible Assets and Goodwill [Table Text Block]
Intangible assets are presented below.
 
September 30,
 
2019
 
2018
 
(in millions)
Capitalized internal-use software:
 
 
 
Cost
$
30.2

 
$
27.6

Accumulated amortization
(17.5
)
 
(14.2
)
Net book value
12.7

 
13.4

 
 
 
 
Business combination-related:
 
 
 
Cost:
 
 
 
Finite-lived intangible assets:
 
 
 
Technology
116.6

 
82.6

Customer relationships and other
370.0

 
358.8

Indefinite-lived intangible assets:
 
 
 
Trade names and trademarks
271.4

 
266.6

 
758.0

 
708.0

Accumulated amortization:
 
 
 
Technology
(76.4
)
 
(72.9
)
Customer relationships and other
(260.6
)
 
(240.4
)
 
(337.0
)
 
(313.3
)
Net book value
421.0

 
394.7

Total intangible assets net book value
$
433.7

 
$
408.1