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Income Taxes - Summary of Information Related to Interest and Penalties on Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Interest expense (income) | $ 0.1 | $ 0.1 |
Accrued interest payable | $ 1.2 |  | $ 1.1

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