Equity (Components of Shareholders' Equity) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Payments for Repurchase of Common Stock							$ 500.1	$ 514.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 7,172.9	$ 6,922.8	$ 7,064.8	$ 6,823.7	$ 7,140.4	$ 7,206.9	7,064.8	7,206.9
Net earnings	463.4	460.3	203.7	519.4	452.6	124.1	1,127.4	1,096.1
Total comprehensive income (loss)	332.3			504.0			1,022.8	952.2
Share-based compensation	13.1	10.2	29.0	12.7	19.6	30.0
Dividends declared to noncontrolling interests	(5.0)		(9.3)	(5.6)	(24.5)	(11.0)
Shares issued under incentive plans, net	(15.2)	(14.9)	(6.3)	(22.5)	(7.2)	(6.6)
Repurchase of ordinary shares	(250.1)		(250.0)	(14.0)	(250.1)	(250.0)	(500.0)
Ending balance	7,279.1	7,172.9	6,922.8	7,343.2	6,823.7	7,140.4	7,279.1	7,343.2
Other	(0.1)		(0.1)	0.1	(0.1)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	42.4	37.0	42.1	36.6	59.7	66.6	42.1	66.6
Net earnings	4.6	4.2	3.8	4.3	4.5	3.7
Dividends declared to noncontrolling interests	(5.0)		(9.3)	(5.6)	(24.5)	(11.0)
Ending balance	$ 41.5	$ 42.4	$ 37.0	$ 35.1	$ 36.6	$ 59.7	$ 41.5	$ 35.1