Subsequent Event (Details) - Subsequent Event - NM Green Holdings, Inc.	Oct. 20, 2020 USD ($) $ / shares
Subsequent Event [Line Items]
Merger agreement, share price (in dollars per share) | $ / shares	$ 50.30
Merger agreement term, ownership percentage benchmark	15.00%
Merger agreement, termination rights term, extension period	3 months
Merger agreement, termination rights term, termination fees	$ 130,000,000
Merger agreement, termination rights term, termination fees as remedy	184,000,000
Merger agreement, termination rights term, termination fees, out-of-pocket fees and expenses reimbursable limit (up to)	$ 10,000,000