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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 31, 2016
Income Taxes |  |  |  |  |
Operating loss carryforwards |  | $ 7.5 |  |  |
Deferred income tax expense (benefit) |  |  |  | $ (12.0) |
Pullmantur | Trademarks and trade names |  |  |  |  |
Income Taxes |  |  |  |  |
Deferred tax liabilities | $ 43.4 |  |  |  |
Valuation allowance adjustment, deferred tax expense (benefit) | $ 31.4 |  |  |  |
Valuation allowance required as per projections (as a percent) | 100.00% |  |  |  |
Deferred income tax expense (benefit) | $ (12.0) |  |  |  |
Other income (expense) |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax expense (benefit) |  | 18.3 | $ 20.1 | $ 11.1 |
Tax years between 2018 and 2024 |  |  |  |  |
Income Taxes |  |  |  |  |
Operating loss carryforwards |  | $ 5.0 |  |  |
Pullmantur and CDF Croisieres De France |  |  |  |  |
Income Taxes |  |  |  |  |
Percentage of subsidiary which has been sold |  | 51.00% |  |  | 51.00%

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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