Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 4,250.4	$ 4,407.8
Accumulated impairment losses	(206.6)	(206.6)
Goodwill [Roll Forward]
Beginning balance	4,201.2
Additions from acquisitions	20.1
Foreign currency translation and other	(177.5)
Ending balance	4,043.8
Performance Solutions
Goodwill [Line Items]
Goodwill	2,265.0	2,299.2
Accumulated impairment losses	(46.6)	(46.6)
Goodwill [Roll Forward]
Beginning balance	2,252.6
Additions from acquisitions	10.6
Foreign currency translation and other	(44.8)
Ending balance	2,218.4
Agricultural Solutions
Goodwill [Line Items]
Goodwill	1,985.4	2,108.6
Accumulated impairment losses	(160.0)	$ (160.0)
Goodwill [Roll Forward]
Beginning balance	1,948.6
Additions from acquisitions	9.5
Foreign currency translation and other	(132.7)
Ending balance	$ 1,825.4

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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