Fair Value Measurements (Assets and Liabilities Reconciliation) (Schedule and Footnote) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net asset (liability) at January 1, 2017	$ 879.5
Gains included in net earnings (loss)
Additions	22.3
Foreign currency translation adjustments, dividends and other, net	(13.4)
Balance of net asset (liability) at March 31, 2017	812.1
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net asset (liability) at January 1, 2017	374.8
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	9.8
Additions	22.3
Foreign currency translation adjustments, dividends and other, net	(13.4)
Balance of net asset (liability) at March 31, 2017	393.5
Cross-Currency and Interest Rate Derivative Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net asset (liability) at January 1, 2017	(10.7)
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	(4.1)
Additions	0.0
Foreign currency translation adjustments, dividends and other, net	0.0
Balance of net asset (liability) at March 31, 2017	(14.8)
Equity-Related Derivative Instruments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net asset (liability) at January 1, 2017	515.4
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	(82.0)
Additions	0.0
Foreign currency translation adjustments, dividends and other, net	0.0
Balance of net asset (liability) at March 31, 2017	433.4
Derivative Financial Instruments, Assets [Member]
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	$ (86.1)