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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) $ in Millions | 3 Months Ended
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Dec. 31, 2020 USD ($)
Quarterly Financial Information Disclosure [Abstract] |
Gain on minority investment | $ 13.0
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss | 1.8
Restructuring charges | $ 2.8

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