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Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 25 Months Ended | 29 Months Ended | 33 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Sep. 30, 2020 | Aug. 03, 2020 USD ($) | Jun. 30, 2020 USD ($) $ / shares | May 31, 2020 GBP (£) | Mar. 31, 2020 USD ($) board_member | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 GBP (£) | Jun. 30, 2019 USD ($) | Jun. 01, 2022 | Mar. 14, 2023 day | Mar. 14, 2023 day | Jun. 30, 2021 USD ($) | Jul. 09, 2020 $ / shares | Jun. 30, 2020 GBP (£) | May 31, 2020 USD ($) ship | Feb. 29, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2019 GBP (£)
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of secured senior term loan |  |  |  |  |  |  |  | $ 40,300,000 | $ 40,335,000 |  | $ 6,326,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, collateral amount |  |  |  |  | $ 20,200,000 |  |  | $ 20,200,000 | $ 20,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  | $ 0.01 |
Proceeds allocated to paid-in-capital |  |  |  |  | $ 209,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | 35,100,000 |  |  | $ 35,100,000 | $ 35,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance costs allocated to paid-in capital |  |  |  |  | 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | £ |  |  |  |  |  | £ 300,000,000.0 |  |  |  | £ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt amortization and financial covenant holiday, amount |  |  |  |  | 900,000,000 |  |  | 900,000,000 | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 5,500,000,000 |  |  | 5,500,000,000 | $ 5,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, monthly minimum liquidity |  |  |  |  |  |  |  | 300,000,000 | 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Finance lease obligation |  |  |  |  | 31,500,000 |  |  | 31,500,000 | 31,500,000 |  |  |  |  |  |  |  |  |  |  | $ 55,600,000 |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to revolving credit facility |  |  |  |  | 600,000,000 |  |  | 600,000,000 | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 11,000,000,000.0 |  |  | $ 11,000,000,000.0 | $ 11,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio |  |  |  |  | 125.00% |  |  | 125.00% | 125.00% |  |  |  |  |  |  |  | 125.00% |  |  |  |
Debt covenant, monthly minimum liquidity |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |
Debt covenant, monthly minimum liquidity |  |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt issuance |  |  |  |  | $ 907,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, collateral amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73,600,000 |  |  |  |  |  |
Scenario, Forecast | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 130,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Contract With Customer, Liability, Up-Front Payment Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agency fees, percentage of loan amount payable |  |  |  |  |  |  |  |  | 2.37% | 2.37% |  |  |  |  |  |  |  |  |  |  |
Minimum | Contract With Customer, Liability, Up-Front Payment Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agency fees, percentage of loan amount payable |  |  |  |  |  |  |  |  | 2.35% | 2.35% |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  | 370,800,000 |  |  | 370,800,000 | $ 370,800,000 |  |  |  |  |  |  |  | £ 300,000,000.0 |  |  |  | £ 1,400,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 3,500,000,000 |  |  | $ 3,500,000,000 | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  | 5.41% |  |  | 5.41% | 5.41% |  |  |  |  |  |  |  | 5.41% |  |  |  |
Unsecured term loans | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  | 2.53% |  |  | 2.53% | 2.53% |  |  |  |  |  |  |  | 2.53% |  |  |  |
Secured senior notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 11.50% |  |  | 11.50% | 11.50% |  |  |  |  |  |  |  | 11.50% |  |  |  |
Secured senior notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 7.25% |  |  | 7.25% | 7.25% |  |  |  |  |  |  |  | 7.25% |  |  |  |
Unsecured senior notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  | 9.13% |  |  | 9.13% | 9.13% |  |  |  |  |  |  |  | 9.13% |  |  |  |
Unsecured senior notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  | 2.65% |  |  | 2.65% | 2.65% |  |  |  |  |  |  |  | 2.65% |  |  |  |
Convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.25% |  |  | 4.25% | 4.25% |  |  |  |  |  |  |  | 4.25% |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 1,150,000,000 |  |  | $ 1,150,000,000 | $ 1,150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, principal of amount redeemed |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  | 0.0138672 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 72.11 |  |  | $ 72.11 | $ 72.11 |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | day |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |
Consecutive trading days | day |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 10 |  |  |  |  |  |  |
Percentage of stock price |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% | 98.00% |  |  |  |  |  |  |
Number of days to convert debt | day |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Unsecured Revolving Credit Facility Due 2024 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,900,000,000 |  |  | $ 1,900,000,000 | $ 1,900,000,000 |  |  |  |  |  |  |  |  |  | $ 1,700,000,000 |  |
Increase to revolving credit facility |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility Due 2022 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,500,000,000 |  |  | $ 1,500,000,000 | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 |  |
Increase to revolving credit facility |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Celebrity Apex Unsecured Term Loan | Celebrity Apex | Bpifrance Assurance Export |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage guaranteed by export credit agency |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Celebrity Apex Unsecured Term Loan | Unsecured term loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured debt |  |  |  |  |  |  | $ 722,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.23% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Term Loan Agreement | Secured term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |
Debt instrument, term |  |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |  |  | 2,350,000,000 |  |  |
Debt instrument, extension period |  |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension fee percent |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests pledged as collateral |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duration fee percentage |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of board members | board_member |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Term Loan Agreement | Secured term loan | Board Member One | Director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Term Loan Agreement | Secured term loan | Board Member Two | Director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | Secured senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,320,000,000 |  |  |
Percentage of equity interests pledged as collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Number of ships owned by subsidiaries | ship |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |
Senior Secured Notes | Secured senior notes | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, principal of amount redeemed |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Senior Secured Notes | Secured senior notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, collateral amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,660,000,000 |  |  |
Senior Secured Notes due 2023 | Secured senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.875% |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |
Senior Secured Notes due 2025 | Secured senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.50% |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,320,000,000 |  |  |
Unsecured Term Loans Guaranteed by Export Credit Agencies | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agency fees, percentage of outstanding loan balance |  |  |  |  |  |  |  |  | 1.96% | 1.96% |  |  |  |  |  |  |  |  |  |  |
Senior Guaranteed Notes | Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 9.125% |  |  | 9.125% | 9.125% |  |  |  |  |  |  |  | 9.125% |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 1,000,000,000.0 |  |  | $ 1,000,000,000.0 | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests pledged as collateral |  |  |  |  | 100.00% |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
LIBOR | Unsecured Revolving Credit Facility Due 2024 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  | 1.30% | 1.30% |  |  |  |  |  |  |  |  |  |  |
LIBOR | Unsecured Revolving Credit Facility Due 2022 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  | 1.30% | 1.30% |  |  |  |  |  |  |  |  |  |  |
LIBOR | Senior Secured Term Loan Agreement | Secured term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR | Senior Secured Term Loan Agreement | Secured term loan | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.75% | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Interest rates based on outstanding loan balance as of June 30, 2020 and, for variable rate debt, include either LIBOR or EURIBOR plus the applicable margin.

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