Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Period for credit risk identified		30 days
Sales revenues totaling	$ 7.1	$ 15.6
Lease revenue	100.7	300.8
Operating lease revenue	100.0	299.0
Finance lease revenue	0.7	1.8
Finance lease revenue, sales revenue		1.7
Finance lease revenue, interest income		$ 0.2
Period for warranties for rental equipment		90 days
Period for warranties for equipment manufactured		1 year
Deferred Income [Member]
Disaggregation Of Revenue [Line Items]
Customer contract liability	20.7	$ 20.7	$ 17.5
Accounts Receivable [Member]
Disaggregation Of Revenue [Line Items]
Unbilled contract assets	$ 0.4	$ 0.4	$ 1.0