Segment Net Sales and Income Before Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 787.6	[1]	$ 696.4	[1]	$ 1,566.9	[1]	$ 1,387.0	[1]
Income Before Income Taxes	132.2	[2]	123.1	[2]	295.4	[2]	266.3	[2]
Operating Segments | Consumer Domestic
Segment Reporting Information [Line Items]
Net Sales	594.5	[1]	506.5	[1]	1,185.5	[1]	1,017.1	[1]
Income Before Income Taxes	113.3	[2]	96.1	[2]	247.2	[2]	208.3	[2]
Operating Segments | Consumer International
Segment Reporting Information [Line Items]
Net Sales	132.7	[1]	121.3	[1]	262.0	[1]	242.7	[1]
Income Before Income Taxes	15.8	[2]	14.8	[2]	37.5	[2]	36.6	[2]
Operating Segments | SPD
Segment Reporting Information [Line Items]
Net Sales	60.4	[1]	68.6	[1]	119.4	[1]	127.2	[1]
Income Before Income Taxes	4.2	[2]	9.8	[2]	11.2	[2]	16.5	[2]
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net Sales	0	[1],[3]	0	[1],[3]	0	[1],[3]	0	[1],[3]
Income Before Income Taxes	$ (1.1)	[2],[3]	$ 2.4	[2],[3]	$ (0.5)	[2],[3]	$ 4.9	[2],[3]

[1] Intersegment sales from Consumer International to Consumer Domestic were $0.3 million and $0.7 million for the quarters ended June 30, 2013 and June 30, 2012, respectively, and were $1.2 million and $1.8 million for the six months ended June 30, 2013 and June 30, 2012, respectively.

[2] In determining Income before Income Taxes, interest expense, investment earnings and other income (expense) were allocated among the segments based upon each segment's relative operating profit.

[3] Corporate consists of equity in earnings (losses) of affiliates from Armand, ArmaKleen and Natronx.