Selected Financial Information Relating To Company's Segments (Parenthetical) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Selling, general and administrative expenses		$ 542.7	$ 439.2	$ 420.1
Corporate
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	[1]	(32.8)	(36.6)	(32.6)
Corporate | Cost of Sales
Segment Reporting Information [Line Items]
Selling, general and administrative expenses		$ 32.8	$ 36.6	$ 32.6

[1] The Corporate segment reflects the following: (A) The administrative costs of the production planning and logistics functions are included in segment Selling, General and Administrative expenses but are elements of Cost of Sales in the Company’s Consolidated Statements of Income. Such amounts were $32.8, $36.6, and $32.6 for 2017, 2016 and 2015, respectively. (B) Equity in earnings (loss) of affiliates from Armand and ArmaKleen for the year ended December 31, 2017 and 2016 and Armand, ArmaKleen and Natronx for the years ended December 31, 2015. (C) Corporate assets include deferred compensation investments and the Company's investment in unconsolidated affiliates.