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Consolidated Balance Sheets (Parenthetical) - shares
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2016
Mar. 31, 2015
Statement of Financial Position [Abstract]        
Series A common stock, shares authorized     600,000,000 600,000,000
Series A common stock, shares outstanding 157,889,045 157,462,140