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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 | Jan. 01, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income taxes |  |  |  |  |
Net operating losses |  |  | $ 240.3 | $ 106.2 |
Net operating loss carryforward |  |  | 23.0 | 38.6 |
Valuation allowance |  |  | 24.6 | 7.1 |
Period applicable for additional special income tax concession |  | 5 years |  |  |
Period applicable for additional special income tax concession, renewal term | 5 years |  |  |  |
Decrease (increase) in foreign income taxes due to special income tax concession in Singapore |  |  | $ 1.3 | $ 2.7 | $ (7.7)
Impact of income tax concession on basic earnings per common share (in dollars per share) |  |  | $ 0.02 | $ 0.04 | $ (0.11)
Impact of income tax concession on diluted earnings per common share (in dollars per share) |  |  | $ 0.02 | $ 0.04 | $ (0.11)
December 31, 2020 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | $ 0.1 |  |
December 31, 2021 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.2 |  |
December 31, 2022 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 1.2 |  |
December 31, 2024 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.2 |  |
December 31, 2025 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 1.0 |  |
December 31, 2026 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.2 |  |
December 31, 2027 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.2 |  |
December 31, 2028 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.3 |  |
December 31, 2029 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.8 |  |
December 31, 2031 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.2 |  |
December 31, 2032 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.5 |  |
December 31, 2033 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.1 |  |
December 31, 2034 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.3 |  |
December 31, 2035 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 0.5 |  |
December 31, 2036 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 2.7 |  |
December 31, 2037 |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | 5.7 |  |
Indefinite |  |  |  |  |
Income taxes |  |  |  |  |
Net operating loss carryforward |  |  | $ 8.8 |  |

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