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Capital Stock (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 170 Months Ended
Jun. 30, 2020
Aug. 05, 2021
Jun. 30, 2021
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchases of common shares, value $ 1.0      
Class A Voting Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized common shares (in shares)     500.0 500.0
Repurchases of common shares, shares 0.2      
Repurchases of common shares, value $ 1.0      
Repurchases of common shares, weighted average repurchase price per share $ 5.75      
Class B Non-Voting Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized common shares (in shares)     500.0 500.0
Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchases of common shares, value   $ 288.1    
Share repurchase program, remaining authorized repurchase amount   $ 179.9