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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, 2013 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income taxes |  |  |  |
Net operating losses |  | $ 106.2 | $ 42.2 |
Net operating loss carryforward |  | 38.6 | 13.0 |
Valuation allowance |  | 7.1 | 2.9 |
Period applicable for additional special income tax concession | 5 years |  |  |
Decrease (increase) in foreign income taxes due to special income tax concession in Singapore |  | $ 2.7 | $ (7.7) | $ 6.3
Impact of income tax concession on basic earnings per common share (in dollars per share) |  | $ 0.04 | $ (0.11) | $ 0.09
Impact of income tax concession on diluted earnings per common share (in dollars per share) |  | $ 0.04 | $ (0.11) | $ 0.09
December 31, 2021 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | $ 0.1 |  |
December 31, 2022 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.1 |  |
December 31, 2023 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.3 |  |
December 31, 2024 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.6 |  |
December 31, 2025 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.9 |  |
December 31, 2036 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 31.8 |  |
Indefinite |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | $ 4.8 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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