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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 14.2 $ 16.6
Work in process 2.6 2.4
Finished goods 11.5 9.0
Total inventories $ 28.3 $ 28.0