Earnings Per Share - Additional Information (Detail) - $ / shares shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities	2.0		2.0
Weighted average exercise price of options	$ 26.50	$ 53.30	$ 26.50
Stock Awards and Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities	6.0		6.0
Common shares equivalents that would have been included in diluted average shares outstanding	1.0		1.0
Maximum [Member] | Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities		0.5