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Fair Value Measurements (Assets and Liabilities Reconciliation) (Schedule and Footnote) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2023
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 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, 2023 $ 1,639.0
Gains included in earnings from continuing operations  
Realized and unrealized gains on derivative instruments, net 145.0
Realized and unrealized losses due to changes in fair values of certain investments, net (118.6)
Additions 73.4
Dispositions (20.7)
Foreign currency translation adjustments and other, net (14.2)
Balance of net assets at September 30, 2023 1,703.9
Investments  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance of net assets at January 1, 2023 1,639.0
Gains included in earnings from continuing operations  
Realized and unrealized gains on derivative instruments, net 0.0
Realized and unrealized losses due to changes in fair values of certain investments, net (118.6)
Additions 73.4
Dispositions (20.7)
Foreign currency translation adjustments and other, net (11.0)
Balance of net assets at September 30, 2023 1,562.1
Equity-related derivative instruments  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance of net assets at January 1, 2023 0.0
Gains included in earnings from continuing operations  
Realized and unrealized gains on derivative instruments, net 145.0
Realized and unrealized losses due to changes in fair values of certain investments, net 0.0
Additions 0.0
Dispositions 0.0
Foreign currency translation adjustments and other, net (3.2)
Balance of net assets at September 30, 2023 141.8
Instruments accounted for under measurement alternative  
Gains included in earnings from continuing operations  
Balance of net assets at September 30, 2023 $ 361.5