Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Period for credit risk identified		30 days
Sales revenues totaling	$ 4.2	$ 7.2
Lease revenue	107.5	205.5
Operating lease revenue	106.8	204.4
Finance lease revenue	0.7	1.0
Finance lease revenue, sales revenue	0.6	0.9
Finance lease revenue, interest income	0.1	$ 0.1
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	24.1	$ 24.1	$ 11.3
Accounts Receivable [Member]
Disaggregation Of Revenue [Line Items]
Unbilled contract assets	$ 1.9	$ 1.9	$ 1.4