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Business and Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2019 Segment	Jun. 30, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number Of Reporting Units | Segment		2
General and Administrative Expenses [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Prior period reclassification adjustment	$ (0.3)		$ (0.4)
Acquisition Related Amortization and Remeasurement Expense [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Prior period reclassification adjustment	0.3		0.4
Other Expense [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Prior period reclassification adjustment	$ 1.1		$ 1.1

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- Definition

Organization consolidation and presentation of financial statements.

+ References

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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

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