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Business Segments (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Gross Profit		$ 1,498.4	$ 842.8	$ 810.0
Canadian Resource Taxes		159.4	70.1	101.1
Gross Profit Excluding Canadian Resource Taxes		1,657.8	912.9	911.1
Operating Income (Loss)		928.3	465.7	319.0
Payments to Acquire Property, Plant, and Equipment		954.5	820.1	843.1
Depreciation, Depletion and Amortization		883.9	665.5	711.2
Equity in net (loss) earnings of nonconsolidated companies		(4.5)	16.7	(15.4)
Assets		20,119.2	18,633.4	16,840.7
Corporate Eliminations And Other Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	[1]	(63.2)	(9.6)	78.6
Canadian Resource Taxes	[1]	0.0	0.0	0.0
Gross Profit Excluding Canadian Resource Taxes	[1]	(63.2)	(9.6)	78.6
Operating Income (Loss)	[1]	(167.6)	(70.3)	67.6
Payments to Acquire Property, Plant, and Equipment	[1]	1.9	14.8	22.7
Depreciation, Depletion and Amortization	[1]	20.2	23.4	25.0
Equity in net (loss) earnings of nonconsolidated companies	[1]	0.1	0.7	0.0
Assets	[1]	526.4	1,254.4	133.4
Corporate Eliminations And Other Segment [Member] | China and India distribution operations [Member]
Segment Reporting Information [Line Items]
Gross Profit		42.8	46.9	21.2
Phosphates Segment
Segment Reporting Information [Line Items]
Gross Profit		581.5	332.2	349.8
Canadian Resource Taxes		0.0		0.0
Gross Profit Excluding Canadian Resource Taxes		581.5	332.2	349.8
Operating Income (Loss)		414.8	191.6	47.8
Payments to Acquire Property, Plant, and Equipment		393.9	401.0	380.0
Depreciation, Depletion and Amortization		403.7	338.0	362.4
Equity in net (loss) earnings of nonconsolidated companies		(4.6)	16.0	0.2
Assets		7,877.3	7,700.6	7,679.7
Potash Segment
Segment Reporting Information [Line Items]
Gross Profit		597.2	391.6	256.6
Canadian Resource Taxes		159.4	70.1	101.1
Gross Profit Excluding Canadian Resource Taxes		756.6	461.7	357.7
Operating Income (Loss)		454.1	281.3	138.8
Payments to Acquire Property, Plant, and Equipment		410.5	371.6	416.7
Depreciation, Depletion and Amortization		301.5	287.2	308.7
Equity in net (loss) earnings of nonconsolidated companies		0.0	0.0	(15.5)
Assets		7,763.1	8,301.7	7,777.9
Mosaic Fertilizantes [Member]
Segment Reporting Information [Line Items]
Gross Profit		382.9	128.6	125.0
Canadian Resource Taxes		0.0	0.0	0.0
Gross Profit Excluding Canadian Resource Taxes		382.9	128.6	125.0
Operating Income (Loss)		227.0	63.1	64.8
Payments to Acquire Property, Plant, and Equipment		148.2	32.7	23.7
Depreciation, Depletion and Amortization		158.5	16.9	15.1
Equity in net (loss) earnings of nonconsolidated companies		0.0	0.0	(0.1)
Assets		3,952.4	1,376.7	1,249.7
Product
Segment Reporting Information [Line Items]
Net sales		9,587.3	7,409.4	7,162.8
Product | Corporate Eliminations And Other Segment [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	(220.0)	(252.5)	(347.7)
Product | Corporate Eliminations And Other Segment [Member] | China and India distribution operations [Member]
Segment Reporting Information [Line Items]
Net sales		533.9	493.2	419.6
Product | Phosphates Segment
Segment Reporting Information [Line Items]
Net sales		3,886.3	3,589.2	3,710.9
Product | Potash Segment
Segment Reporting Information [Line Items]
Net sales		2,173.9	1,852.6	1,685.7
Product | Mosaic Fertilizantes [Member]
Segment Reporting Information [Line Items]
Net sales		3,747.1	2,220.1	2,113.9
Product | Operating Segments [Member] | Corporate Eliminations And Other Segment [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	579.1	526.2	447.5
Product | Operating Segments [Member] | Phosphates Segment
Segment Reporting Information [Line Items]
Net sales		3,106.3	2,826.6	2,928.4
Product | Operating Segments [Member] | Potash Segment
Segment Reporting Information [Line Items]
Net sales		2,154.8	1,836.5	1,673.0
Product | Operating Segments [Member] | Mosaic Fertilizantes [Member]
Segment Reporting Information [Line Items]
Net sales		3,747.1	2,220.1	2,113.9
Product | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		0.0	0.0	0.0
Product | Intersegment Eliminations [Member] | Corporate Eliminations And Other Segment [Member]
Segment Reporting Information [Line Items]
Net sales	[1]	(799.1)	(778.7)	(795.2)
Product | Intersegment Eliminations [Member] | Phosphates Segment
Segment Reporting Information [Line Items]
Net sales		780.0	762.6	782.5
Product | Intersegment Eliminations [Member] | Potash Segment
Segment Reporting Information [Line Items]
Net sales		19.1	16.1	12.7
Product | Intersegment Eliminations [Member] | Mosaic Fertilizantes [Member]
Segment Reporting Information [Line Items]
Net sales		$ 0.0	$ 0.0	$ 0.0
[1] The "Corporate, Eliminations and Other" category includes the results of our ancillary distribution operations in India and China. For the years ended December 31, 2018, 2017 and 2016, distribution operations in India and China had revenues of $533.9 million, $493.2 million, and $419.6 million, respectively and gross margins of $42.8 million, $46.9 million, and $21.2 million, respectively.

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