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Earnings Per Share - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Forward Sale Agreement [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Sale of common shares	1,000,000.0			1,000,000.0
Performance Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Mark-to-market adjustment			$ (0.3)	$ (5.6)	$ 1.9
Common shares, shares issued		570,295

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- Definition

Common shares to be issued through forward equity agreement.

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- Definition

Mark to market adjustment.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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