Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2023		Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Finite-life intangible assets, gross carrying value	$ 145.0		$ 145.0
Finite-life intangible assets, accumulated amortization	48.0		40.0
Finite-life intangible assets, accumulated impairment losses	0.0		0.0
Finite-life intangible assets, net carrying value	97.0		105.0
Indefinite-life intangible assets, gross carrying value	352.0	[1]	352.0	[2]
Indefinite-life intangible assets, accumulated impairment losses	31.0	[1]	31.0	[2]
Indefinite-life intangible assets, net carrying value	321.0	[1]	321.0	[2]
Gross Carrying Value	497.0		497.0
Accumulated Impairment Losses	31.0		31.0
Net Carrying Value	418.0		426.0
Indefinite-life intangible assets, net carrying value	321.0	[1]	321.0	[2]
Trade Names
Finite-Lived Intangible Assets [Line Items]
Indefinite-life intangible assets, net carrying value	318.7		319.0
Indefinite-life intangible assets, net carrying value	318.7		319.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-life intangible assets, gross carrying value	97.0		97.0
Finite-life intangible assets, accumulated amortization	35.0		29.0
Finite-life intangible assets, accumulated impairment losses	0.0		0.0
Finite-life intangible assets, net carrying value	$ 62.0		$ 68.0
Customer relationships | Weighted Average
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period (Years)	9 years 7 months 6 days		10 years 7 months 6 days
Galapagos operating license
Finite-Lived Intangible Assets [Line Items]
Finite-life intangible assets, gross carrying value	$ 48.0		$ 48.0
Finite-life intangible assets, accumulated amortization	13.0		11.0
Finite-life intangible assets, accumulated impairment losses	0.0		0.0
Finite-life intangible assets, net carrying value	$ 35.0		$ 37.0
Galapagos operating license | Weighted Average
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted Average Amortization Period (Years)	20 years 7 months 6 days		21 years 7 months 6 days

[1] Primarily relates to the Silversea Cruises trade name representing approximately $318.7 million.

[2] Primarily relates to the Silversea Cruises trade name representing approximately $319 million.