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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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