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Identifiable Intangible Assets
 12 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Identifiable Intangible Assets
Intangible Assets and Goodwill
Intangible Assets
Direct internal and external costs to develop software licensed by Technologies’ customers are capitalized. Capitalized costs are amortized over the 6-year estimated useful life of the software, beginning when the software is complete and ready for its intended use. At September 30, 2019, the remaining weighted-average amortization period for this software was 2.5 years. Amortization expense related to such software assets was $3.3 million, $2.9 million and $2.4 million for 2019, 2018 and 2017, respectively. Amortization expense for each of the next five years is scheduled to be $3.7 million in 2020, $2.9 million in 2021, $2.4 million in 2022, $1.9 million in 2023 and $1.2 million in 2024.
At September 30, 2019, the remaining weighted-average amortization period for the business combination-related finite-lived customer relationship and technology intangible assets were 6.3 years and 5.2 years, respectively. Amortization expense related to these assets was $23.7 million, $19.9 million and $19.7 million for 2019, 2018 and 2017, respectively. Amortization expense for each of the next five years is scheduled to be $25.0 million in 2020, $24.9 million in 2021, $24.9 million in 2022, $24.6 million in 2023 and $24.1 million in 2024.
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


Goodwill
Goodwill is tested for impairment at the reporting unit level (operating segment or one level below an operating segment) on an annual basis each September 1st and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value.
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