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Stock-Based Compensation (Details) - shares
shares in Millions
Mar. 31, 2020
May 30, 2019
Apr. 05, 2017
Apr. 04, 2017
Stock-Based Compensation        
Shares authorized for issuance under share-based compensation plan   1.8 12.7 9.2
Shares available for grant 4.8 1.9    
Maximum        
Stock-Based Compensation        
Shares authorized for issuance under share-based compensation plan   4.8