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Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€)
Fair Value Disclosures [Abstract] |  |  |  |
Maximum length of time hedged in derivative contract | 3 years |  |  |
Derivative instruments disclosure |  |  |  |
Aggregate cost of ships expected to enter service | $ 14,200.0 |  |  |
Deposit for the purchase of ships expected to enter service | $ 684.8 |  |  |
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate | 66.30% | 65.90% |  | 66.30%
Exchange gains (losses) recorded in other income (expense) | $ (1.5) | $ 0.4 | $ 57.6 |
Foreign currency forward | Not Designated as Hedging Instrument |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | 364.0 |  |  |
Change in fair value of foreign currency forward contracts recognized in earnings | (19.0) | 1.4 | (62.4) |
Exchange gains (losses) recorded in other income (expense) |  | 0.4 | $ 57.6 |
Foreign currency forward | Designated as Hedging Instrument |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | 299.7 |  |  | € 245.0
Foreign exchange contracts |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | $ 3,100.0 | $ 2,900.0 |  |

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