Supplementary Data - Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 478.4	$ 488.5	$ 501.6	$ 492.5	$ 488.6	$ 480.6	$ 462.3	$ 447.1	$ 1,961.0	$ 1,878.6	$ 1,770.1
Gross profit from continuing operations	202.2	209.6	214.7	211.1	212.2	208.2	196.6	196.8	837.6	813.8	777.3
Net loss from continuing operations	(14.2)	(4.3)	(49.6)	(8.9)	(18.8)	(36.9)	(73.9)	(62.2)	(324.4)	(296.2)	(73.7)
Net income (loss) from discontinued operations	50.4	(401.6)	61.4	46.9	(126.9)	(29.4)	13.9	38.6	(242.9)	(103.8)	113.8
Net loss attributable to common stockholders	$ 36.2	$ (405.9)	$ 11.8	$ 38.0	$ (145.7)	$ (66.3)	$ (60.0)	$ (23.6)	$ (324.4)	$ (296.2)	$ (40.8)
(Loss) earnings per share
Basic from continuing operations (in dollars per share)	$ (0.05)	$ (0.02)	$ (0.17)	$ (0.04)	$ (0.06)	$ (0.13)	$ (0.26)	$ (0.23)	$ (0.27)	$ (0.68)	$ (0.62)
Basic from discontinued operations (in dollars per share)	0.18	(1.40)	0.21	0.17	(0.43)	(0.11)	0.05	0.14	(0.86)	(0.36)	0.45
Basic attributable to common stockholders (in dollars per share)	0.13	(1.42)	0.04	0.13	(0.49)	(0.24)	(0.21)	(0.09)	(1.13)	(1.04)	(0.17)
Diluted from continuing operations (in dollars per share)	(0.05)	(0.02)	(0.17)	(0.04)	(0.06)	(0.13)	(0.26)	(0.23)	(0.27)	(0.68)	(1.06)
Diluted from discontinued operations (in dollars per share)	0.18	(1.4)	0.21	0.17	(0.43)	(0.11)	0.05	0.14	(0.86)	(0.36)	0.41
Diluted attributable to common stockholders (in dollars per share)	$ 0.13	$ (1.42)	$ 0.04	$ 0.13	$ (0.49)	$ (0.24)	$ (0.21)	$ (0.09)	$ (1.13)	$ (1.04)	$ (0.65)
Held-for-sale | Agricultural Solutions Business
Quarterly Financial Information Disclosure [Abstract]
Net income (loss) from discontinued operations									$ (242.9)	$ (103.8)	$ 113.8
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimated impairment loss	$ 74.0	$ 376.0			$ 160.0				$ 450.0	$ 0.0	$ 0.0