Preferred Stock - Narrative (Details) - $ / shares	Sep. 30, 2020	Jun. 30, 2020	Oct. 02, 2017
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	500,000	500,000	21,000,000
Preferred stock, par value (in US$ per share)	$ 1.00	$ 1.00	$ 1,110
Preferred stock, issued (in shares)			14,700,000
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	21,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, issued (in shares)			14,700