Statement of Changes in Equity and Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 1,097.7	$ 1,154.9
Net earnings	$ 119.8	$ 78.5	210.9	151.3
(Earnings) loss attributable to noncontrolling interest, net of tax	1.4	(0.8)	(0.2)	(1.9)
Dividends declared			(88.4)	(85.2)
Dividends paid to noncontrolling interest			(1.7)
Treasury stock purchased			(167.7)	(127.8)
Treasury stock issued			20.5	21.1
Foreign currency translation adjustments	(16.9)	2.8	5.5	(35.0)
Cash flow hedges, net of tax	(0.5)	1.3	6.0	(0.4)
Defined benefit pension plans, net of tax	0.9	0.5	1.6	1.8
Stock options and benefit plan transactions, net of tax			16.4	29.3
Acquisition of noncontrolling interest			(35.2)
Ending balance	1,065.6	1,110.0	1,065.6	1,110.0
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			2,209.2	2,061.3
Net earnings			210.9	151.3
(Earnings) loss attributable to noncontrolling interest, net of tax			(0.2)	(1.9)
Dividends declared			(90.9)	(87.7)
Ending balance	2,329.0	2,123.0	2,329.0	2,123.0
Common Stock & Additional Contributed Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			531.5	504.4
Dividends declared			2.5	2.5
Treasury stock issued			(15.8)	(20.4)
Stock options and benefit plan transactions, net of tax			16.4	29.3
Acquisition of noncontrolling interest			(27.9)
Ending balance	506.7	515.8	506.7	515.8
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,564.0)	(1,416.6)
Treasury stock purchased			(167.7)	(127.8)
Treasury stock issued			36.3	41.5
Ending balance	(1,695.4)	(1,502.9)	(1,695.4)	(1,502.9)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			12.1	8.4
(Earnings) loss attributable to noncontrolling interest, net of tax			0.2	1.9
Dividends declared			0.0
Dividends paid to noncontrolling interest			(1.7)
Foreign currency translation adjustments			0.0	0.1
Acquisition of noncontrolling interest			(8.3)
Ending balance	2.3	10.4	2.3	10.4
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(91.1)	(2.6)
Foreign currency translation adjustments			5.5	(35.1)
Cash flow hedges, net of tax			6.0	(0.4)
Defined benefit pension plans, net of tax			1.6	1.8
Acquisition of noncontrolling interest			1.0
Ending balance	$ (77.0)	$ (36.3)	$ (77.0)	$ (36.3)