Statement of Changes in Equity and Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 1,094.0	$ 1,097.7
Effect of accounting change on prior years (See Note 2)					$ 1.2
Adjusted beginning balance, January 1, 2017					1,095.2
Net earnings	$ 87.6	$ 119.8	173.7	210.9
Earnings attributable to noncontrolling interest, net of tax	0.0	1.4	0.0	(0.2)
Dividends declared			(92.7)	(88.4)
Dividends paid to noncontrolling interest				(1.7)
Treasury stock purchased			(118.3)	(167.7)
Treasury stock issued			12.5	20.5
Foreign currency translation adjustments			44.1	5.5
Cash flow hedges, net of tax	2.1	(0.5)	4.6	6.0
Defined benefit pension plans, net of tax	0.5	0.9	1.1	1.6
Stock options and benefit plan transactions, net of tax			16.0	16.4
Purchase of remaining interest in noncontrolling interest, net of acquisitions			(2.6)
Acquisition of noncontrolling interest				(35.2)
Ending balance	1,133.6	1,065.6	1,133.6	1,065.6
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			2,410.5	2,209.2
Effect of accounting change on prior years (See Note 2)					1.2
Adjusted beginning balance, January 1, 2017					2,411.7
Net earnings			173.7	210.9
Earnings attributable to noncontrolling interest, net of tax			0.0	(0.2)
Dividends declared			(95.2)	(90.9)
Ending balance	2,490.2	2,329.0	2,490.2	2,329.0
Common Stock & Additional Contributed Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			508.2	531.5
Adjusted beginning balance, January 1, 2017					508.2
Dividends declared			2.5	2.5
Treasury stock issued			(19.4)	(15.8)
Stock options and benefit plan transactions, net of tax			16.0	16.4
Purchase of remaining interest in noncontrolling interest, net of acquisitions			(0.7)
Acquisition of noncontrolling interest				(27.9)
Ending balance	506.6	506.7	506.6	506.7
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,713.5)	(1,564.0)
Adjusted beginning balance, January 1, 2017					(1,713.5)
Treasury stock purchased			(118.3)	(167.7)
Treasury stock issued			31.9	36.3
Ending balance	(1,799.9)	(1,695.4)	(1,799.9)	(1,695.4)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			2.4	12.1
Adjusted beginning balance, January 1, 2017					2.4
Earnings attributable to noncontrolling interest, net of tax			0.0	0.2
Dividends declared			0.0
Dividends paid to noncontrolling interest				(1.7)
Foreign currency translation adjustments				0.0
Purchase of remaining interest in noncontrolling interest, net of acquisitions			(1.9)
Acquisition of noncontrolling interest				(8.3)
Ending balance	0.5	2.3	0.5	2.3
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(113.6)	(91.1)
Adjusted beginning balance, January 1, 2017					$ (113.6)
Foreign currency translation adjustments			44.1	5.5
Cash flow hedges, net of tax			4.6	6.0
Defined benefit pension plans, net of tax			1.1	1.6
Purchase of remaining interest in noncontrolling interest, net of acquisitions			0.0
Acquisition of noncontrolling interest				1.0
Ending balance	$ (63.8)	$ (77.0)	$ (63.8)	$ (77.0)