Segment Information - Financial Information Regarding Each Reportable Segment (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
Net Sales:
Total	$ 1,068.7	$ 904.3	$ 941.1	$ 861.8	$ 950.0	$ 890.5	$ 921.6	$ 823.8	$ 3,775.9	$ 3,585.9	$ 2,542.3
Depreciation and amortization:
Total									354.2	342.3	251.0
Capital expenditures and product registrations:
Total									99.9	92.7	82.3
Adjusted EBITDA:
Total									820.9	769.5	567.7
Performance Solutions
Net Sales:
Total									1,878.6	1,770.1	800.8
Depreciation and amortization:
Total									155.0	156.5	80.0
Capital expenditures and product registrations:
Total									29.3	29.3	17.6
Adjusted EBITDA:
Total									432.7	401.3	224.3
Agricultural Solutions
Net Sales:
Total									1,897.3	1,815.8	1,741.5
Depreciation and amortization:
Total									199.2	185.8	171.0
Capital expenditures and product registrations:
Total									70.6	63.4	64.7
Adjusted EBITDA:
Total									$ 388.2	$ 368.2	$ 343.4