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Earnings Per Share and Weighted-Average Shares Outstanding - Additional Information (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share
Potentially securities excluded from computation of fully diluted earnings per share amount (in shares)	0.1	97.5	1.0	90.7
Partnership Interest
Earnings Per Share
Anti-dilutive securities excluded from computation of fully diluted earnings per share amount (in shares)		86.9		85.7
Restricted Stock Units (RSUs)
Earnings Per Share
Anti-dilutive securities excluded from computation of fully diluted earnings per share amount (in shares)		10.6		5.0

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- Definition

Earnings Per Share, Potentially Dilutive Securities, Shares

+ References

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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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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