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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2018
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, 2016
$
162.6

 
$
17.5

 
$
180.1

Acquisition (Note 23)
5.0

 
—

 
5.0

Currency translation adjustment
(2.3
)
 
(0.2
)
 
(2.5
)
Balance at September 30, 2017
$
165.3

 
$
17.3

 
$
182.6

Currency translation adjustment
0.3

 
0.1

 
0.4

Balance at September 30, 2018
$
165.6

 
$
17.4

 
$
183.0