Brazilian Chemical Business - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset impairment charge and other asset write-offs									$ 2.1	$ 5.6	$ 19.2
Net Sales	$ 1,033.1	$ 967.9	$ 898.0	$ 877.2	$ 896.0	$ 870.7	$ 877.4	$ 849.0	$ 3,776.2	3,493.1	$ 3,394.8
Brazilian Chemical
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset impairment charge and other asset write-offs					$ 4.9
Sale of business				4.5
Severance and other charges				$ 3.5
Net Sales										$ 22.0