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Dividends - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 31, 2020	Feb. 29, 2020	Aug. 31, 2019	Feb. 28, 2019
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.10	$ 0.10	$ 0.30	$ 0.30
Series B Preferred Stock
Class of Stock [Line Items]
Dividends payable					$ 13.4	$ 13.4	$ 13.4	$ 13.4

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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