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Inventories (Tables)
12 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
June 30,
2019
 
2018
(In millions)
 
 
 
Raw materials
$
42.7

 
$
32.3

Work in process
15.4

 
9.6

Finished goods
4.6

 
2.5

Inventories
$
62.7

 
$
44.4