Fair Value Measurements (Assets and Liabilities Reconciliation) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets at January 1, 2025	$ 1,477.2
Losses included in net earnings
Realized and unrealized losses on derivative instruments, net	(49.2)
Realized and unrealized losses due to changes in fair values of certain investments, net	(43.5)
Additions	11.6
Foreign currency translation adjustments and other, net	54.3
Balance of net assets at March 31, 2024	$ 1,450.4
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 6)
Fair Value Recurring Basis Unobservable Input Reconciliation Net Derivative Asset Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag	true
Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets at January 1, 2025	$ 1,263.8
Losses included in net earnings
Realized and unrealized losses on derivative instruments, net	0.0
Realized and unrealized losses due to changes in fair values of certain investments, net	(43.5)
Additions	11.6
Foreign currency translation adjustments and other, net	44.7
Balance of net assets at March 31, 2024	1,276.6
Equity-related derivative instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets at January 1, 2025	213.4
Losses included in net earnings
Realized and unrealized losses on derivative instruments, net	(49.2)
Realized and unrealized losses due to changes in fair values of certain investments, net	0.0
Additions	0.0
Foreign currency translation adjustments and other, net	9.6
Balance of net assets at March 31, 2024	173.8
Instruments accounted for under measurement alternative
Losses included in net earnings
Balance of net assets at March 31, 2024	$ 361.3