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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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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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