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Revenue - Schedule of Changes in Deferred Revenue (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue From Contract With Customer [Abstract]    
Deferred revenue, beginning of period $ 25.5 $ 23.2
New billings 85.7 63.6
Revenue recognized (83.6) (63.8)
Effect of exchange rate (0.8)  
Deferred revenue, end of period $ 26.8 $ 23.0