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Revenue - Schedule of Revenue by Country (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 842.5	$ 824.1	$ 740.7
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	579.3	578.1	513.8
Canada [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	223.5	237.0	224.0
Other Country [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 39.7	$ 9.0	$ 2.9

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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