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Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, Gross		$ 1,200.0
Goodwill, net of accumulated amortization	$ 1,156.9
Foreign currency translation	(31.9)
Goodwill, net of accumulated amortization	1,125.0
Potash segment
Goodwill [Line Items]
Goodwill, net of accumulated amortization	1,039.8
Foreign currency translation	(22.6)
Goodwill, net of accumulated amortization	$ 1,017.2
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	19.70%
Mosaic Fertilizantes segment
Goodwill [Line Items]
Goodwill, net of accumulated amortization	$ 105.0
Foreign currency translation	(9.3)
Goodwill, net of accumulated amortization	95.7
Corporate, other and intersegment eliminations
Goodwill [Line Items]
Goodwill, net of accumulated amortization	12.1
Foreign currency translation	0.0
Goodwill, net of accumulated amortization	$ 12.1

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount before 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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