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Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 EUR (€)
Derivative instruments disclosure |  |  |  |
Aggregate cost of ships on order | $ 13,300.0 |  |  |
Amount deposited for cost of ships on order | $ 465.7 |  |  |
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate | 54.00% | 66.70% |  | 54.00%
Exchange gains (losses) recorded in other income (expense) | $ (75.6) | $ 39.8 | $ 34.6 |
Foreign currency forward | Not Designated |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | 843.3 |  |  |
Change in fair value of foreign currency forward contracts recognized in earnings | 62.0 | (51.1) | (55.5) |
Exchange gains (losses) recorded in other income (expense) | (75.6) | 39.8 | $ 34.6 |
Foreign currency forward | Designated as Hedging Instrument |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | 121.3 |  |  | € 101.0
Foreign exchange contracts |  |  |  |
Derivative instruments disclosure |  |  |  |
Notional amount | $ 4,600.0 | $ 1,300.0 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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