Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Shareholders' equity			$ 4,899.0	$ 2,869.0	$ 5,087.0	$ 8,761.0
Accounting Standards Update [Extensible Enumeration]					Accounting Standards Update 2020-06 [Member]
Common stock issued (in shares)	16.9
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01	$ 0.01
Common stock, price per share (in dollars per share)	$ 91.00
Proceeds from sale of stock	$ 1,500.0
Proceeds from sale of noncontrolling interest			$ 209.0	$ 0.0	$ 0.0
Port Of Miami
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of investment sold		80.00%
Proceeds from sale of noncontrolling interest		$ 208.9
Port Of Miami | Variable Interest Entity, Primary Beneficiary
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Ownership interest retained, percent		20.00%
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Shareholders' equity					$ (162.0)