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

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

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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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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Stockholders' Equity (Deficit) - Summary of Cash Dividends Paid (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 11, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 17, 2021	Dec. 31, 2017
Subsequent Event [Line Items]
Total Cash Dividends Paid		$ 100.3	$ 99.1	$ 102.9
Total Cash Dividends Paid Per Common Share (in dollars per share)		$ 0.64	$ 0.64	$ 0.64
Dividends per share on common stock (in dollars per share)		$ 0.64	$ 0.64	$ 0.64
Common stock, shares issued (in shares)		231,958,083	231,622,535	231,619,037		230,080,944
Common stock, shares outstanding (in shares)		154,889,772	154,512,813	155,654,370
Subsequent Event
Subsequent Event [Line Items]
Dividends per share on common stock (in dollars per share)	$ 0.16
Estimated dividend payment					$ 24.8
Common stock, shares issued (in shares)					154,900,000
Common stock, shares outstanding (in shares)					154,900,000