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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes to the Carrying Amount of Goodwill by Segment
Changes to the carrying amount of goodwill by segment are as follows:
 
Materials
 
Delivery
Systems and
Services
 
Total
(In millions)
 
 
 
 
 
Balance at September 30, 2014
$
166.0

 
$
18.2

 
$
184.2

Currency translation adjustment
(15.4
)
 
(1.8
)
 
(17.2
)
Balance at September 30, 2015
$
150.6

 
$
16.4

 
$
167.0

Currency translation adjustment
12.0

 
1.1

 
13.1

Balance at September 30, 2016
$
162.6

 
$
17.5

 
$
180.1