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Intangible Assets - (Notes)
 6 Months Ended
Mar. 31, 2017
Intangible Assets [Abstract]  
Intangible Assets Disclosure [Text Block]
Intangible Assets
During the six months ended March 31, 2017 , the Company recorded additional intangible assets of $6.0 million as part of the ICAP acquisition. See Note 16 - Acquisitions for additional discussion.
The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows:
 
March 31, 2017
 
September 30, 2016
(in millions)
Gross Amount
 
Accumulated
Amortization
 
Net Amount
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
Intangible assets subject to amortization
 
 
 
 
 
 
 
 
 
 
 
Trade name
$
1.1

 
$
(0.8
)
 
$
0.3

 
$
1.1

 
$
(0.6
)
 
$
0.5

Software programs/platforms
2.7

 
(2.4
)
 
0.3

 
2.7

 
(2.4
)
 
0.3

Customer base
20.0

 
(6.9
)
 
13.1

 
14.0

 
(5.7
)
 
8.3

Total intangible assets
$
23.8

 
$
(10.1
)
 
$
13.7

 
$
17.8

 
$
(8.7
)
 
$
9.1


Amortization expense related to intangible assets was $1.4 million and $0.8 million for the six months ended March 31, 2017 and 2016, respectively.
As of March 31, 2017, the estimated future amortization expense was as follows:
(in millions)
 
Fiscal 2017 (remaining six months)
$
1.4

Fiscal 2018
2.2

Fiscal 2019
2.2

Fiscal 2020
2.0

Fiscal 2021 and thereafter
5.9

 
$
13.7