Brazil's Chemical Business - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset impairment charge and other asset write-offs										$ 5.6	$ 19.2	$ 6.4
Net Sales		$ 896.0	$ 870.7	$ 877.4	$ 849.0	$ 873.6	$ 861.8	$ 847.1	$ 812.3	3,493.1	$ 3,394.8	$ 3,297.6
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
Net Sales										$ 22.0
Subsequent Event | Brazilian Chemical
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Severance and other charges	$ 5.0