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Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Beginning balance	$ 1,693,600,000	$ 1,630,900,000
Foreign currency translation	(82,300,000)	62,700,000
Goodwill, Period Increase (Decrease)	0
Ending balance	1,707,500,000	1,693,600,000
Goodwill, Impairment Loss, Net of Tax	0
Goodwill, Acquired During Period	96,200,000
Goodwill determined to be tax deductible	153,900,000
Phosphates Segment [Member]
Goodwill [Line Items]
Beginning balance	492,400,000	492,400,000
Foreign currency translation	0	0
Ending balance	588,600,000	492,400,000
Goodwill, Acquired During Period	$ 96,200,000
Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	18.00%
Beginning balance	$ 1,076,900,000	1,013,600,000
Foreign currency translation	(76,500,000)	63,300,000
Ending balance	1,000,400,000	1,076,900,000
Mosaic Fertilizantes [Member]
Goodwill [Line Items]
Beginning balance	124,300,000	124,900,000
Foreign currency translation	(5,800,000)	(600,000)
Goodwill, Period Increase (Decrease)	(12,100,000)
Ending balance	106,400,000	$ 124,300,000
Corporate Eliminations And Other Segment [Member]
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	12,100,000
Ending balance	$ 12,100,000
Minimum
Goodwill [Line Items]
Terminal Value Growth Rate	2.00%
WACC fifty basis point decrease [Member] | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	24.50%
WACC twenty-five basis point decrease [Member] | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	21.30%
WACC twenty-five basis point increase [Member] | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	14.70%
Scenario, Adjustment [Member] | WACC fifty basis point increase [Member] | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	11.30%

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