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Stock Based and Other Management Compensation - Shares Authorized for Distribution (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 229,250,000 979,790,000 0
Deferred share units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 31,829,000 42,243,000 0
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 260,640,000 6,740,000 0