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Consolidated Balance Sheets (Parenthetical) - shares
shares in Millions
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Statement of Financial Position [Abstract]          
Common stock, shares outstanding 75.4 74.7 73.5 70.6 68.4