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Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 EUR (€)
Derivative instruments disclosure |  |  |  |
Aggregate cost of ships on order | $ 11,400.0 |  |  |
Amount deposited for cost of ships on order | $ 651.7 |  |  |
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate | 53.50% | 54.00% |  | 53.50%
Exchange gains (losses) recorded in other income (expense) | $ 57.6 | $ (75.6) | $ 39.8 |
Foreign currency forward | Not Designated |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | 741.5 |  |  |
Change in fair value of foreign currency forward contracts recognized in earnings | (62.4) | 62.0 | (51.1) |
Exchange gains (losses) recorded in other income (expense) | 57.6 | (75.6) | $ 39.8 |
Foreign currency forward | Designated as Hedging Instrument |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | 115.5 |  |  | € 101.0
Foreign exchange contracts |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | $ 3,700.0 | $ 4,600.0 |  |

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