Discontinued Operations - Carrying Value of Major Classes of Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Assets
Current assets of discontinued operations	$ 1,545.0		$ 1,545.0		$ 1,432.1
Non-current assets of discontinued operations	3,383.5		3,383.5		4,168.6
Liabilities
Current liabilities of discontinued operations	842.4		842.4		764.9
Non-current liabilities of discontinued operations	406.4		406.4		472.6
Agricultural Solutions Business | Discontinued Operations, Held-for-sale
Assets
Cash and cash equivalents	151.2		151.2		219.4
Accounts receivable, net	815.4		815.4		740.5
Inventories	402.1		402.1		304.0
Other current assets	176.3		176.3		168.2
Current assets of discontinued operations	1,545.0		1,545.0		1,432.1
Property, plant and equipment, net	156.2		156.2		164.9
Goodwill	1,784.1		1,784.1		1,948.5
Intangible assets, net	1,750.3		1,750.3		1,976.5
Other assets	(307.1)		(307.1)		78.7
Non-current assets of discontinued operations	3,383.5		3,383.5		4,168.6
Liabilities
Accounts payable	329.8		329.8		350.6
Current installments of revolving credit facilities	71.9		71.9		28.8
Accrued expenses and other current liabilities	440.7		440.7		385.5
Current liabilities of discontinued operations	842.4		842.4		764.9
Deferred income taxes	357.2		357.2		409.6
Other liabilities	49.2		49.2		63.0
Non-current liabilities of discontinued operations	406.4		406.4		472.6
Estimated impairment loss	$ 376.0	$ 0.0	$ 376.0	$ 0.0	$ 376.0