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Fair Value Measurements (Assets and Liabilities Reconciliation) (Schedule and Footnote) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Recurring Basis Unobservable Input Reconciliation Net Derivative Asset Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag	true
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets at January 1, 2024	$ 1,826.4
Gains (losses) included in net loss earnings
Realized and unrealized losses on derivative instruments, net	(43.5)
Realized and unrealized gains due to changes in fair values of certain investments, net	3.4
Additions	30.2
Foreign currency translation adjustments and other, net	(30.8)
Balance of net assets at March 31, 2024	$ 1,785.7
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized and unrealized gains (losses) on derivative instruments, net (note 5)
Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets at January 1, 2024	$ 1,563.1
Gains (losses) included in net loss earnings
Realized and unrealized losses on derivative instruments, net	0.0
Realized and unrealized gains due to changes in fair values of certain investments, net	3.4
Additions	30.2
Foreign currency translation adjustments and other, net	(24.8)
Balance of net assets at March 31, 2024	1,571.9
Equity-related derivative instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets at January 1, 2024	263.3
Gains (losses) included in net loss earnings
Realized and unrealized losses on derivative instruments, net	(43.5)
Realized and unrealized gains due to changes in fair values of certain investments, net	0.0
Additions	0.0
Foreign currency translation adjustments and other, net	(6.0)
Balance of net assets at March 31, 2024	213.8
Instruments accounted for under measurement alternative
Gains (losses) included in net loss earnings
Balance of net assets at March 31, 2024	$ 369.4

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