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Identifiable Intangible Assets
 12 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Identifiable Intangible Assets
Intangible Assets
Intangible assets are presented below.
 
September 30,
 
2014
 
2013
 
(in millions)
Capitalized external-use software:
 
 
 
Cost
$
14.3

 
$
12.2

Accumulated amortization
(5.4
)
 
(4.3
)
Net book value
8.9

 
7.9

 
 
 
 
Business combination-related:
 
 
 
Cost:
 
 
 
Finite-lived intangible assets:
 
 
 
Technology
80.4

 
80.1

Customer relationships and other
400.2

 
398.1

Indefinite-lived intangible assets:
 
 
 
Trade names and trademarks
300.0

 
300.0

 
780.6

 
778.2

Accumulated amortization:
 
 
 
Technology
(68.1
)
 
(61.5
)
Customer relationships and other
(193.2
)
 
(171.5
)
 
(261.3
)
 
(233.0
)
Net book value
519.3

 
545.2

 
 
 
 
Goodwill
5.4

 
—

Total intangible assets net book value
$
533.6

 
$
553.1


Direct internal and external costs to develop external-use software are capitalized. Capitalized costs are depreciated over the estimated useful life of the software, beginning when the software is complete and ready for sale. During 2014, we revised our estimate of the useful life of the software to 6 years from 3 years. At September 30, 2014, the remaining weighted-average amortization period for the external-use software was 4.8 years. Amortization expense related to such software assets was $1.1 million, $2.3 million and $1.5 million for 2014, 2013 and 2012, respectively. Amortization expense for each of the next five years is scheduled to be $1.5 million in 2015, $1.8 million in 2016, $1.8 million in 2017, $1.5 million in 2018 and $1.2 million in 2019.
At September 30, 2014, the remaining weighted-average amortization period for the business combination-related finite-lived intangible assets was 9.1 years. Amortization expense related to theses assets was $28.3 million, $29.5 million and $29.4 million for 2014, 2013 and 2012, respectively. Amortization expense for each of the next five years is scheduled to be $27.7 million in 2015, $22.2 million in 2016, $22.2 million in 2017, $22.4 million in 2018 and $22.3 million in 2019.