Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Purchase and retirement of common stock (in shares)			6,378,025	7,275,610		16,947,393
Dividends declared on common stock (in dollars per share)	$ 0		$ 0.10	$ 0.10	$ 0.10	$ 0.10
Issuance of shares of common stock pursuant to employee stock plans (in shares)	47,741	454,621	1,062,052	48,547	1,046,122	552,752
Issuance of shares of AAG common stock pursuant to a public stock offering (in shares)		85,215,000