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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill [Line Items]  
Sensitivity Analysis WACC [Table Text Block]
Assuming that all other components of our fair value estimate remain unchanged, a change in the WACC would have the following effect on estimated fair values in excess of carrying values:
 
 
 
 
Sensitivity Analysis - Percent of Fair Values in Excess of Carrying Values
 
 
Excess at Current WACC
 
 WACC Decreased by 50 Basis Points
 
 WACC Decreased by 25 Basis Points
 
 WACC Increased by 25 Basis Points
 
WACC Increased by 50 Basis Points
Potash Reporting Unit
 
18.0%
 
24.5%
 
21.3%
 
14.7%
 
11.3%
Goodwill
The changes in the carrying amount of goodwill, by reporting unit, as of December 31, 2018 and 2017, are as follows:
(in millions)
Phosphates
 
Potash
 
Mosaic Fertilizantes
 
Corporate, Eliminations and Other
Total
Balance as of December 31, 2016
$
492.4

 
$
1,013.6

 
$
124.9

 
$
—

$
1,630.9

Foreign currency translation
—

 
63.3

 
(0.6
)
 
—

62.7

Balance as of December 31, 2017
492.4

 
1,076.9

 
124.3

 
—

1,693.6

Foreign currency translation
—

 
(76.5
)
 
(5.8
)
 
—

(82.3
)
Allocation of goodwill due to Realignment
—

 
—

 
(12.1
)
 
12.1

—

Goodwill acquired in the Vale acquisition
96.2

 
—

 
—

 
—

96.2

Balance as of December 31, 2018
$
588.6

 
$
1,000.4

 
$
106.4

 
$
12.1

$
1,707.5