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Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income taxes |  |  |  |
Net operating losses |  | $ 375.9 | $ 275.3 |
Deffered tax asset |  | 40.1 | 33.7 |
Net operating loss carryforward, Total |  | 40.1 | 33.7 |
Valuation allowance |  | 32.5 | 24.3 |
Valuation allowance, deferred tax asset for NOLs |  | 27.1 |  |
Period applicable for additional special income tax concession | 5 years |  |  |
Decrease in foreign income tax |  | $ 4.3 | $ 0.0 | $ 1.3
Basic earnings per common share (in dollars per share) |  | $ 0.07 | $ 0 | $ 0.02
Diluted earnings per common share (in dollars per share) |  | $ 0.06 | $ 0 | $ 0.02
2020-2039 |  |  |  |
Income taxes |  |  |  |
Net operating Loss carryforward, US |  | $ 11.2 |  |
Net operating Loss carryforward, Foreign |  | 3.1 |  |
Indefinite |  |  |  |
Income taxes |  |  |  |
Net operating Loss carryforward, US |  | 2.5 |  |
Net operating Loss carryforward, Foreign |  | $ 23.3 |  |

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