Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Period for credit risk identified		30 days
Sales revenues totaling	$ 0.6	$ 7.8
Lease revenue	118.1	323.5
Operating lease revenue	117.8	322.2
Finance lease revenue	0.3	1.3
Finance lease revenue, sales revenue	0.3	1.2
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	27.7	$ 27.7	$ 11.3
Accounts Receivable [Member]
Disaggregation Of Revenue [Line Items]
Unbilled contract assets	$ 1.8	$ 1.8	$ 1.4