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Income Taxes - Summary of Information Included in Continuing Operations Related to Interest and Penalties on Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Interest expense (income) | $ 0.2 | $ 0.1 |
Accrued interest payable | $ 1.3 |  | $ 1.1

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