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Equity Incentive Plan - Outperformance share awards (Details) - Outperformance share awards - USD ($)
$ in Millions
3 Months Ended
Jun. 03, 2019
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Threshold consecutive trading days   50 days
Requisite service period of the awards 3 years  
Stock-based compensation not yet recognized   $ 0.5
Recognition period for costs not yet recognized   4 years 3 months
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outperformance payout range (shares)   0
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outperformance payout range (shares)   1,000,000
Final Date    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting rate (as a percent)   33.30%
First Anniversary of Final Date    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting rate (as a percent)   33.30%
Second Anniversary of Final Date    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting rate (as a percent)   33.30%