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Reportable segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Revenue $ 1,943,655 $ 2,265,803 $ 2,157,323
Cost of sales (1,383,603) (1,485,631) (1,394,822)
Administrative expenses (117,180) (118,126) (101,171)
Interest Expense (76,939) (57,807) (50,124)
Depreciation and amortisation expense (202,264) (220,827) (240,526)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 9,786 6,351 14,452
Income tax expense, continuing operations 110,019 178,975 166,173
Income (loss) before taxes 390,622 621,038 594,590
Net Income (Loss) 280,603 442,063 428,417
Assets 4,684,151 4,268,094 4,296,236
Equity-accounted investees 109,435 111,549 152,630
Incorporation of non-current assets other than financial instruments, deferred tax assets, net defined benefit assets and rights arising from insurance contracts (8,778) (17,131) 0
Increase of non-current assets     0
Liabilities 2,549,679 2,130,292 2,048,768
Impairment loss recognized in profit or loss (1,057) 2,967 (31,899)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 426,971 524,839 758,272
Cash flows from (used in) investing activities (485,471) (187,004) (248,067)
Cash flows from (used in) financing activities 105,896 (387,313) (411,920)
Operating Segments [Member]      
Statement [Line Items]      
Revenue 1,943,655 2,265,803 2,157,323
Cost of sales (1,383,603) (1,485,631) (1,394,822)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (202,264) (220,827) (240,526)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 560,052 780,172 762,501
Net Income (Loss) 560,052 780,172 762,501
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 (17,583)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Unallocated amounts [member]      
Statement [Line Items]      
Revenue     0
Cost of sales 0 0 0
Administrative expenses (117,180) (118,126) (101,171)
Interest Expense (76,939) (57,807) (50,124)
Depreciation and amortisation expense     0
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 9,786 6,351 14,452
Income tax expense, continuing operations (110,019) (178,975) (166,173)
Income (loss) before taxes (169,430) (159,134) (167,911)
Net Income (Loss) (279,449) (338,109) (334,084)
Assets 4,684,151 4,268,094 4,296,236
Equity-accounted investees 109,435 111,549 152,630
Incorporation of non-current assets other than financial instruments, deferred tax assets, net defined benefit assets and rights arising from insurance contracts 124,569 (15,028) 0
Increase of non-current assets     0
Liabilities 2,549,679 2,130,292 2,048,768
Impairment loss recognized in profit or loss (1,057) 2,967 (14,316)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 426,971 524,839 758,272
Cash flows from (used in) investing activities (485,471) (187,004) (248,067)
Cash flows from (used in) financing activities 105,896 (387,313) (411,920)
Specialty plant nutrients [Member]      
Statement [Line Items]      
Revenue 723,920 781,751 697,251
Cost of sales (573,808) (613,267) (555,356)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (68,007) (79,061) (73,702)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 150,112 168,484 141,895
Net Income (Loss) 150,112 168,484 145,779
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 (15,025)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Iodine and its derivatives [Member]      
Statement [Line Items]      
Revenue 371,020 324,972 231,144
Cost of sales (230,468) (217,464) (199,808)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (43,533) (42,438) (44,252)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 140,552 107,508 52,315
Net Income (Loss) 140,552 107,508 52,315
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 335
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Lithium and its derivatives [Member]      
Statement [Line Items]      
Revenue 505,714 734,801 644,573
Cost of sales (306,250) (316,875) (189,242)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (45,443) (42,283) (18,036)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 199,464 417,926 339,011
Net Income (Loss) 199,464 417,926 455,331
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 1,112
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Industrial chemicals [Member]      
Statement [Line Items]      
Revenue 94,875 108,267 135,578
Cost of sales (63,590) (72,964) (91,753)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (6,885) (8,454) (16,050)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 31,285 35,303 43,825
Net Income (Loss) 31,285 35,303 36,759
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 (3,546)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Potassium [Member]      
Statement [Line Items]      
Revenue 212,151 267,474 403,323
Cost of sales (176,199) (217,386) (313,690)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (37,862) (47,940) (88,130)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 35,952 50,088 65,636
Net Income (Loss) 35,952 50,088 65,636
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 (240)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Other products and services [Member]      
Statement [Line Items]      
Revenue 35,975 48,538 62,238
Cost of sales (33,288) (47,675) (44,973)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (534) (651) (356)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 2,687 863 5,796
Net Income (Loss) 2,687 863 5,796
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 (219)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Reportable segments [member]      
Statement [Line Items]      
Revenue 1,943,655 2,265,803 2,157,323
Cost of sales (1,383,603) (1,485,631) (1,394,822)
Administrative expenses 0 0 0
Interest Expense 0 0 0
Depreciation and amortisation expense (202,264) (220,827) (240,526)
The entity's interest in the profit or loss of associates and joint ventures accounted for by the equity method 0 0 0
Income tax expense, continuing operations 0 0 0
Income (loss) before taxes 560,052 780,172 762,501
Net Income (Loss) 560,052 780,172 762,501
Assets 0 0 0
Equity-accounted investees 0 0 0
Increase of non-current assets 0 0 0
Liabilities 0 0 0
Impairment loss recognized in profit or loss 0 0 (17,583)
Reversal of impairment losses recognized in profit or loss for the period 0 0 0
Cash flows from (used in) operating activities 0 0 0
Cash flows from (used in) investing activities 0 0 0
Cash flows from (used in) financing activities 0 0 0
Parent [Member]      
Statement [Line Items]      
Assets 4,069,649 3,737,892  
Liabilities 1,983,382 1,652,401  
Parent [Member] | Operating Segments [Member]      
Statement [Line Items]      
Revenue 1,943,655 2,265,803 2,157,323
Parent [Member] | Unallocated amounts [member]      
Statement [Line Items]      
Revenue 0 0 0
Parent [Member] | Specialty plant nutrients [Member]      
Statement [Line Items]      
Revenue 723,920 781,751 697,251
Parent [Member] | Iodine and its derivatives [Member]      
Statement [Line Items]      
Revenue 371,020 324,972 252,123
Parent [Member] | Lithium and its derivatives [Member]      
Statement [Line Items]      
Revenue 505,714 734,801 644,573
Parent [Member] | Industrial chemicals [Member]      
Statement [Line Items]      
Revenue 94,875 108,267 135,578
Parent [Member] | Potassium [Member]      
Statement [Line Items]      
Revenue 212,151 267,474 379,326
Parent [Member] | Other products and services [Member]      
Statement [Line Items]      
Revenue 35,975 48,538 48,472
Parent [Member] | Reportable segments [member]      
Statement [Line Items]      
Revenue 1,943,655 2,265,803 2,157,323
Other Operating Segment [Member]      
Statement [Line Items]      
Revenue 0 0  
Other Operating Segment [Member] | Operating Segments [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Unallocated amounts [member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Specialty plant nutrients [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Iodine and its derivatives [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Lithium and its derivatives [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Industrial chemicals [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Potassium [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Other products and services [Member]      
Statement [Line Items]      
Revenue 0 0 0
Other Operating Segment [Member] | Reportable segments [member]      
Statement [Line Items]      
Revenue $ 0 $ 0 $ 0