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Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Beginning balance	$ 1,156.9	$ 1,707.5
Goodwill, Foreign Currency Translation Gain (Loss)	16.1	38.0
Ending balance	1,173.0	1,156.9	$ 1,707.5
Goodwill, Impairment Loss	0.0	(588.6)	0.0
Goodwill determined to be tax deductible	$ 3.6
Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	20.90%
Beginning balance	$ 1,039.8	1,000.4
Goodwill, Foreign Currency Translation Gain (Loss)	23.4	39.4
Ending balance	1,063.2	1,039.8	1,000.4
Goodwill, Impairment Loss		0.0
Mosaic Fertilizantes
Goodwill [Line Items]
Beginning balance	105.0	106.4
Goodwill, Foreign Currency Translation Gain (Loss)	(7.3)	(1.4)
Ending balance	97.7	105.0	106.4
Goodwill, Impairment Loss		0.0
Corporate Eliminations And Other Segment
Goodwill [Line Items]
Beginning balance	12.1	12.1
Goodwill, Foreign Currency Translation Gain (Loss)	0.0	0.0
Ending balance	12.1	12.1	12.1
Goodwill, Impairment Loss		0.0
Phosphates Segment
Goodwill [Line Items]
Beginning balance	0.0	588.6
Goodwill, Foreign Currency Translation Gain (Loss)	0.0	0.0
Ending balance	$ 0.0	0.0	$ 588.6
Goodwill, Impairment Loss		$ (588.6)
Minimum
Goodwill [Line Items]
Terminal Value Growth Rate	2.00%
WACC fifty basis point decrease | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	26.80%
WACC twenty-five basis point decrease | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	23.90%
WACC twenty-five basis point increase | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	17.80%
WACC fifty basis point increase | Potash Segment
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	14.70%

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