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Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Millions
Mar. 31, 2020
Mar. 31, 2019
Class A Voting Common Shares    
Common shares, no par value $ 0 $ 0
Authorized common shares 500.0 500.0
Common shares, shares issued 83.0 82.5
Class B Non-Voting Common Shares    
Common shares, no par value $ 0 $ 0
Authorized common shares 500.0 500.0
Common shares, shares issued 136.4 133.5