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Inventories
 3 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
3. Inventories

Major components of inventories are summarized below.

(In millions)
September 30, 2018
 
June 30, 2018
Raw materials
 
$
32.4

 
$
32.1

Work in process
 
15.7

 
9.6

Finished goods
 
2.2

 
2.5

Inventories
 
$
50.3

 
$
44.2