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Business Combination (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Long-term debt |  |  |  |  | $ 130,000,000.0
Silversea Cruises |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of interests acquired | 66.70% | 66.70% |  |  |
Payments to acquire business | $ 1,020,000,000 |  |  |  |
Contingent consideration | 44,000,000 | $ 44,000,000 |  |  |
Redeemable noncontrolling interest | 537,770,000 | 537,770,000 |  |  |
Transaction costs |  |  | $ 25,900,000 | $ 30,600,000 |
Silversea Cruises | Silversea Cruises |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Long-term debt | $ 700,000,000 | $ 700,000,000 |  |  |
Minimum | Silversea Cruises |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, shares (in shares) |  | 0 |  |  |
Maximum | Silversea Cruises |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, shares (in shares) |  | 472,000 |  |  |
Silversea Cruises Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  | 33.30% | 33.30% |

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