Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Earnings
Net sales	$ 7,409.4	$ 7,162.8	$ 8,895.3
Cost of goods sold	6,566.6	6,352.8	7,177.4
Gross margin	842.8	810.0	1,717.9
Selling, general and administrative expenses	301.3	304.2	361.2
Other operating expenses	75.8	186.8	77.9
Operating earnings	465.7	319.0	1,278.8
Interest expense, net	(138.1)	(112.4)	(97.8)
Foreign currency transaction gain (loss)	49.9	40.1	(60.5)
Other expense	(3.5)	(4.3)	(17.2)
Earnings from consolidated companies before income taxes	374.0	242.4	1,103.3
Provision for (benefit from) income taxes	494.9	(74.2)	99.1
(Loss) earnings from consolidated companies	(120.9)	316.6	1,004.2
Equity in net earnings (loss) of nonconsolidated companies	16.7	(15.4)	(2.4)
Net (loss) earnings including noncontrolling interests	(104.2)	301.2	1,001.8
Less: Net earnings attributable to noncontrolling interests	3.0	3.4	1.4
Net (loss) earnings attributable to Mosaic	$ (107.2)	$ 297.8	$ 1,000.4
Basic net (loss) earnings per share attributable to Mosaic (in usd per share)	$ (0.31)	$ 0.85	$ 2.79
Basic weighted average number of shares outstanding (in shares)	350.9	350.4	358.5
Diluted net (loss) earnings per share attributable to Mosaic (in usd per share)	$ (0.31)	$ 0.85	$ 2.78
Diluted weighted average number of shares outstanding (in shares)	350.9	351.7	360.3