Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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- Definition

Percentage of Aggregate Cost Exposed to Fluctuations in the Euro Exchange Rate.

+ References

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- Definition

Purchase Contract, Deposit.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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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