Condensed Consolidated Statements of Stockholders' Deficit (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Issuance of shares of AAG common stock pursuant to employee stock plans (in shares)	30,970	115,833	1,700,380	47,741	454,621	1,062,052
Purchase and retirement of common stock (in shares)						6,378,025
Dividends declared on common stock (in dollars per share)	$ 0			$ 0		$ 0.10
At-The-Market Offering
Issuance of shares of AAG common stock (in shares)			18,194,573
Public Stock Offering
Issuance of shares of AAG common stock (in shares)		5,956,191			85,215,000