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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2020
Mar. 31, 2021
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Nov. 30, 2020
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost       $ 66.6      
Unrecognized compensation expense, period for recognition       2 years 9 months 18 days      
Accelerated vesting of awards     $ 1.8   $ 10.2    
Forecast | Former Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Accelerated vesting of awards   $ 12.0          
2020 Inducement Equity Award Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common shares reserved for grant (in shares)       700,000   1,000,000.0  
Myovant 2016 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common shares reserved for grant (in shares)       1,000,000.0     4,500,000
Common shares reserved for grant, annual percentage increase             4.00%
Increase in common shares reserved for grant (in shares) 3,600,000