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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Percentage of Aggregate Cost Exposed to Fluctuations in the Euro Exchange Rate.

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Purchase Contract, Deposit.

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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.

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

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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