Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Preferred stock authorized (in shares)	40,000,000	40,000,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	400,000,000	400,000,000
Common stock issued (in shares)	188,000,000	188,000,000
Common stock outstanding (in shares)	188,000,000	188,000,000