Equity (Components of Shareholders' Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Balance at December 31:	$ 7,012.4	$ 8,059.1
Net earnings (loss)	102.2	(71.5)
Currency translation	136.5	187.6
Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	(1.4)	(2.3)
Pension and OPEB adjustments, net of tax	29.9	5.8
Total comprehensive income (loss)	267.2	119.6
Share-based compensation	6.9	15.0
Dividends to noncontrolling interests	(3.5)	(3.7)
Dividends to ordinary shareholders	(0.2)	(23.1)
Accretion of Exchangeable Senior Notes from Temporary Equity	2.7	3.3
Shares issued under incentive plans, net	13.0	36.0
Other		(0.5)
Balance at March 31:	7,298.5	8,205.7
Shareholders' Equity [Member]
Balance at December 31:	6,924.3	7,964.3
Net earnings (loss)	95.6	(77.6)
Currency translation	136.5	187.6
Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	(1.4)	(2.3)
Pension and OPEB adjustments, net of tax	29.9	5.8
Total comprehensive income (loss)	260.6	113.5
Share-based compensation	6.9	15.0
Dividends to noncontrolling interests	0	0
Dividends to ordinary shareholders	(0.2)	(23.1)
Accretion of Exchangeable Senior Notes from Temporary Equity	2.7	3.3
Shares issued under incentive plans, net	13.0	36.0
Other		(0.5)
Balance at March 31:	7,207.3	8,108.5
Noncontrolling Interest [Member]
Balance at December 31:	88.1	94.8
Net earnings (loss)	6.6	6.1
Currency translation	0	0
Change in value of marketable securities and derivatives qualifying as cash flow hedges, net of tax	0	0
Pension and OPEB adjustments, net of tax	0	0
Total comprehensive income (loss)	6.6	6.1
Share-based compensation	0	0
Dividends to noncontrolling interests	(3.5)	(3.7)
Dividends to ordinary shareholders	0	0
Accretion of Exchangeable Senior Notes from Temporary Equity	0	0
Shares issued under incentive plans, net	0	0
Other		0
Balance at March 31:	$ 91.2	$ 97.2