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Revenue - Reconciliation of Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Revenue From Contract With Customer [Abstract]    
Deferred revenue - beginning balance $ 2.2 $ 2.6
Revenue recognized (0.4) (1.7)
Prepayments 0.3 1.6
Deferred revenue - Ending Balance $ 2.1 $ 2.5