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Events after the reporting date (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended
--- | --- | ---
Feb. 05, 2020 USD ($) $ / shares | Jan. 31, 2020 shares $ / shares
Share Transactions [Member] | Restricted Shares [Member] |  |
Restricted Shares [Abstract] |  |
Number of shares, awarded (in shares) |  | 660,000
Number of shares, vested in year one (in shares) |  | 253,334
Number of shares, vested in year two (in shares) |  | 53,333
Number of shares, vested in year three (in shares) |  | 153,333
Number of shares, vesting subject to certain market conditions (in shares) |  | 200,000
Number of shares, vesting in year one to three (in shares) |  | 460,000
Number of shares granted, share price (in dollars per share) | $ / shares |  | $ 3.5637
Share Transactions [Member] | Restricted Shares [Member] | Board of Directors [Member] |  |
Restricted Shares [Abstract] |  |
Number of shares, awarded (in shares) | $ / shares |  | 150,000
Dividend Declared for Q1 [Member] |  |
Dividend [Abstract] |  |
Dividend declare date | Feb. 05, 2020 |
Dividend declared (in dollars per share) | $ / shares | $ 0.32 |
Dividends payable date | Feb. 25, 2020 |
Dividend record date | Feb. 18, 2020 |
Total dividend payment | $ | $ 47.0 |

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