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Business Combination (Details) - USD ($) | Jul. 31, 2018 | Apr. 30, 2019
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Silversea Cruises |  |
Business Acquisition [Line Items] |  |
Percentage of interests acquired | 66.70% |
Payments to acquire business | $ 1,020,000,000.00 |
Contingent consideration | 44,000,000.0 |
Silversea Cruises |  |
Business Acquisition [Line Items] |  |
Long-term debt |  | $ 700,000,000
Silversea Cruises | Silversea Cruises |  |
Business Acquisition [Line Items] |  |
Long-term debt | $ 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 |

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