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Condensed consolidating financial information - Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 282.7 | $ 296.3 | $ 579.0 | $ 576.8
Other customers | 187.3 | 92.5 | 345.5 | 177.8
Total net sales | 470.0 | 388.8 | 924.5 | 754.6
Cost of goods sold | 436.3 | 366.3 | 876.2 | 715.3
Gross profit | 33.7 | 22.5 | 48.3 | 39.3
Selling, general and administrative expenses | 12.0 | 9.4 | 22.7 | 20.1
Other operating expense, net | (0.2) | (0.2) | (0.6) | (1.1)
Operating income | 21.5 | 12.9 | 25.0 | 18.1
Interest expense | (5.6) | (5.5) | (11.2) | (11.0)
Intercompany interest | 0.0 | 0.0 | 0.0 | 0.0
Interest income | 0.5 | 0.3 | 0.9 | 0.5
Net gain (loss) on forward and derivative contracts | 1.2 | 3.0 | 1.9 | (13.2)
Other income (expense) - net | 2.1 | (1.9) | 1.3 | (1.5)
Income (loss) before income taxes and equity in earnings of joint ventures | 19.7 | 8.8 | 17.9 | (7.1)
Income tax (expense) benefit | (2.3) | (1.4) | (1.4) | (1.1)
Income (loss) before equity in earnings of joint ventures | 17.4 | 7.4 | 16.5 | (8.2)
Equity in earnings (loss) of joint ventures | 2.0 | (0.3) | 2.6 | 0.2
Net income (loss) | 19.4 | 7.1 | 19.1 | (8.0)
Other comprehensive income (loss) before income tax effect | 3.0 | (0.1) | 3.8 | 1.6
Income tax effect | (0.4) | 0.3 | (0.8) | (0.7)
Other comprehensive income | 2.6 | 0.2 | 3.0 | 0.9
Total comprehensive income (loss) | 22.0 | 7.3 | 22.1 | (7.1)
Consolidating Adjustments [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0.0 | 0.0 | 0.0 | 0.0
Other customers | 0.0 | 0.0 | 0.0 | 0.0
Total net sales | 0.0 | 0.0 | 0.0 | 0.0
Cost of goods sold | 0.0 | 0.0 | 0.0 | 0.0
Gross profit | 0.0 | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses | 0.0 | 0.0 | 0.0 | 0.0
Other operating expense, net | 0.0 | 0.0 | 0.0 | 0.0
Operating income | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 0.0 | 0.0 | 0.0 | 0.0
Intercompany interest | 0.0 | 0.0 | 0.0 | 0.0
Interest income | 0.0 | 0.0 | 0.0 | 0.0
Net gain (loss) on forward and derivative contracts | 0.0 | 0.0 | 0.0 | 0.0
Other income (expense) - net | 0.0 | 0.0 | 0.0 | 0.0
Income (loss) before income taxes and equity in earnings of joint ventures | 0.0 | 0.0 | 0.0 | 0.0
Income tax (expense) benefit | 0.0 | 0.0 | 0.0 | 0.0
Income (loss) before equity in earnings of joint ventures | 0.0 | 0.0 | 0.0 | 0.0
Equity in earnings (loss) of joint ventures | (23.8) | (13.1) | (28.6) | (3.7)
Net income (loss) | (23.8) | (13.1) | (28.6) | (3.7)
Other comprehensive income (loss) before income tax effect | (3.1) | 1.0 | (4.3) | (0.6)
Income tax effect | 0.0 | 0.0 | 0.0 | (0.1)
Other comprehensive income | (3.1) | 1.0 | (4.3) | (0.7)
Total comprehensive income (loss) | (26.9) | (12.1) | (32.9) | (4.4)
The Company [Member] | Reportable Legal Entities [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 0.0 | 0.0 | 0.0 | 0.0
Other customers | 0.0 | 0.0 | 0.0 | 0.0
Total net sales | 0.0 | 0.0 | 0.0 | 0.0
Cost of goods sold | 0.0 | 0.0 | 0.0 | 0.0
Gross profit | 0.0 | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses | 11.4 | 8.9 | 21.4 | 19.1
Other operating expense, net | 0.0 | 0.0 | 0.0 | 0.0
Operating income | (11.4) | (8.9) | (21.4) | (19.1)
Interest expense | (5.1) | (5.0) | (10.3) | (10.2)
Intercompany interest | 9.0 | 9.2 | 18.1 | 18.2
Interest income | 0.1 | 0.0 | 0.2 | 0.1
Net gain (loss) on forward and derivative contracts | 0.0 | 0.0 | 0.0 | 0.0
Other income (expense) - net | 0.0 | (0.1) | 0.7 | 0.7
Income (loss) before income taxes and equity in earnings of joint ventures | (7.4) | (4.8) | (12.7) | (10.3)
Income tax (expense) benefit | 0.3 | 0.6 | 0.1 | 1.1
Income (loss) before equity in earnings of joint ventures | (7.1) | (4.2) | (12.6) | (9.2)
Equity in earnings (loss) of joint ventures | 26.5 | 11.3 | 31.7 | 1.2
Net income (loss) | 19.4 | 7.1 | 19.1 | (8.0)
Other comprehensive income (loss) before income tax effect | 3.0 | (0.1) | 3.8 | 1.6
Income tax effect | (0.4) | 0.3 | (0.8) | (0.7)
Other comprehensive income | 2.6 | 0.2 | 3.0 | 0.9
Total comprehensive income (loss) | $ 22.0 | 7.3 | $ 22.1 | (7.1)
Combined Guarantor Subsidiaries [Member] |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Ownership percentage | 100.00% |  | 100.00% |
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | $ 93.6 | 134.8 | $ 204.4 | 265.9
Other customers | 185.8 | 92.5 | 343.2 | 177.7
Total net sales | 279.4 | 227.3 | 547.6 | 443.6
Cost of goods sold | 258.5 | 220.5 | 519.6 | 434.3
Gross profit | 20.9 | 6.8 | 28.0 | 9.3
Selling, general and administrative expenses | 0.0 | 0.0 | 0.0 | 0.0
Other operating expense, net | 0.0 | 0.0 | 0.0 | 0.0
Operating income | 20.9 | 6.8 | 28.0 | 9.3
Interest expense | (0.4) | (0.4) | (0.8) | (0.7)
Intercompany interest | 2.3 | 2.1 | 4.6 | 4.2
Interest income | 0.0 | 0.0 | 0.0 | 0.0
Net gain (loss) on forward and derivative contracts | 0.4 | 2.7 | 0.7 | (13.2)
Other income (expense) - net | (0.1) | 0.1 | (0.2) | 0.2
Income (loss) before income taxes and equity in earnings of joint ventures | 23.1 | 11.3 | 32.3 | (0.2)
Income tax (expense) benefit | 0.0 | (0.5) | 0.0 | 0.0
Income (loss) before equity in earnings of joint ventures | 23.1 | 10.8 | 32.3 | (0.2)
Equity in earnings (loss) of joint ventures | (2.7) | 1.7 | (3.1) | 2.5
Net income (loss) | 20.4 | 12.5 | 29.2 | 2.3
Other comprehensive income (loss) before income tax effect | 2.8 | (1.5) | 3.5 | (0.2)
Income tax effect | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income | 2.8 | (1.5) | 3.5 | (0.2)
Total comprehensive income (loss) | 23.2 | 11.0 | 32.7 | 2.1
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Revenue, Net [Abstract] |  |  |  |
Related parties | 189.1 | 161.5 | 374.6 | 310.9
Other customers | 1.5 | 0.0 | 2.3 | 0.1
Total net sales | 190.6 | 161.5 | 376.9 | 311.0
Cost of goods sold | 177.8 | 145.8 | 356.6 | 281.0
Gross profit | 12.8 | 15.7 | 20.3 | 30.0
Selling, general and administrative expenses | 0.6 | 0.5 | 1.3 | 1.0
Other operating expense, net | (0.2) | (0.2) | (0.6) | (1.1)
Operating income | 12.0 | 15.0 | 18.4 | 27.9
Interest expense | (0.1) | (0.1) | (0.1) | (0.1)
Intercompany interest | (11.3) | (11.3) | (22.7) | (22.4)
Interest income | 0.4 | 0.3 | 0.7 | 0.4
Net gain (loss) on forward and derivative contracts | 0.8 | 0.3 | 1.2 | 0.0
Other income (expense) - net | 2.2 | (1.9) | 0.8 | (2.4)
Income (loss) before income taxes and equity in earnings of joint ventures | 4.0 | 2.3 | (1.7) | 3.4
Income tax (expense) benefit | (2.6) | (1.5) | (1.5) | (2.2)
Income (loss) before equity in earnings of joint ventures | 1.4 | 0.8 | (3.2) | 1.2
Equity in earnings (loss) of joint ventures | 2.0 | (0.2) | 2.6 | 0.2
Net income (loss) | 3.4 | 0.6 | (0.6) | 1.4
Other comprehensive income (loss) before income tax effect | 0.3 | 0.5 | 0.8 | 0.8
Income tax effect | 0.0 | 0.0 | 0.0 | 0.1
Other comprehensive income | 0.3 | 0.5 | 0.8 | 0.9
Total comprehensive income (loss) | $ 3.7 | $ 1.1 | $ 0.2 | $ 2.3

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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