Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	$ 9,800.0
Deposit for the purchase of ships expected to enter service	$ 831.6
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate	52.30%	59.00%
Exchange gains (losses) recorded in other income (expense)	$ 93.0	$ 24.3	$ (1.5)
Foreign currency forward \| Not Designated as Hedging Instrument
Derivative instruments disclosure
Notional amount	1,100.0
Change in fair value of foreign currency forward contracts recognized in earnings	(101.8)	(30.9)	$ (19.0)
Foreign currency forward contracts
Derivative instruments disclosure
Notional amount	$ 2,900.0	$ 3,400.0

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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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Nominal or face amount used to calculate payment on derivative.

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-Name Accounting Standards Codification
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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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