Fair Value Measurements (Assets and Liabilities Reconciliation) (Schedule and Footnote) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets (liabilities) at January 1, 2019	$ 1,149.7
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	7.5
Additions	15.2
Transfers out of Level 3	7.5
Foreign currency translation adjustments and other, net	(3.6)
Balance of net assets (liabilities) at March 31, 2019	1,169.8
Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets (liabilities) at January 1, 2019	418.9
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	(6.5)
Additions	15.2
Transfers out of Level 3	0.0
Foreign currency translation adjustments and other, net	(3.0)
Balance of net assets (liabilities) at March 31, 2019	424.6
Cross-currency, interest rate and foreign currency derivative contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets (liabilities) at January 1, 2019	(14.1)
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	(7.3)
Additions	0.0
Transfers out of Level 3	7.5
Foreign currency translation adjustments and other, net	(0.4)
Balance of net assets (liabilities) at March 31, 2019	(14.3)
Equity-related derivative instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of net assets (liabilities) at January 1, 2019	744.9
Gains included in net earnings (loss)
Realized and unrealized (gains) losses, net	14.8
Additions	0.0
Transfers out of Level 3	0.0
Foreign currency translation adjustments and other, net	(0.2)
Balance of net assets (liabilities) at March 31, 2019	$ 759.5