Discontinued Operations - Carrying Value of Major Classes of Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Current assets of discontinued operations	$ 1,621.3		$ 1,432.1	$ 1,621.3	$ 1,432.1
Non-current assets of discontinued operations	3,412.4		4,168.6	3,412.4	4,168.6
Liabilities
Current liabilities of discontinued operations	826.8		764.9	826.8	764.9
Deferred income taxes	450.0		487.0	450.0	487.0
Non-current liabilities of discontinued operations	416.2		472.6	416.2	472.6
Agricultural Solutions Business | Held-for-sale
Assets
Cash and cash equivalents	177.8		219.4	177.8	219.4
Accounts receivable, net	919.4		740.5	919.4	740.5
Inventories	369.1		304.0	369.1	304.0
Other current assets	155.0		168.2	155.0	168.2
Current assets of discontinued operations	1,621.3		1,432.1	1,621.3	1,432.1
Property, plant and equipment, net	172.0		164.9	172.0	164.9
Goodwill	1,816.9		1,948.5	1,816.9	1,948.5
Intangible assets, net	1,797.7		1,976.5	1,797.7	1,976.5
Other assets	(374.2)		78.7	(374.2)	78.7
Non-current assets of discontinued operations	3,412.4		4,168.6	3,412.4	4,168.6
Liabilities
Accounts payable	365.7		350.6	365.7	350.6
Current installments of revolving credit facilities	52.5		28.8	52.5	28.8
Accrued expenses and other current liabilities	408.6		385.5	408.6	385.5
Current liabilities of discontinued operations	826.8		764.9	826.8	764.9
Deferred income taxes	369.9		409.6	369.9	409.6
Other liabilities	46.3		63.0	46.3	63.0
Non-current liabilities of discontinued operations	416.2		472.6	416.2	472.6
Estimated impairment loss	$ 74.0	$ 376.0	$ 160.0	$ 450.0	$ 0.0	$ 0.0