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Condensed consolidating financial information - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Revenue, Net [Abstract]      
Related parties $ 296.2 $ 280.6  
Other customers 158.3 85.2  
Total net sales 454.5 365.8  
Cost of goods sold 440.0 348.9  
Gross profit 14.5 16.9  
Selling, general and administrative expenses 10.7 10.7  
Other operating expense, net 0.3 1.0  
Operating income 3.5 5.2  
Interest expense (5.5) (5.6)  
Intercompany interest 0.0 0.0  
Interest income 0.5 0.2  
Net gain (loss) on forward and derivative contracts 0.7 (16.1) $ (16.1)
Other income (expense) - net (1.1) 0.4  
Loss before income taxes and equity in earnings of joint ventures (1.9) (15.9)  
Income tax (expense) benefit 1.0 0.3  
Loss before equity in earnings of joint ventures (0.9) (15.6)  
Equity in earnings (loss) of joint ventures 0.6 0.5  
Net loss (0.3) (15.1)  
Other comprehensive income (loss) before income tax effect 0.8 1.8  
Income tax effect (0.4) (1.1)  
Other comprehensive income 0.4 0.7  
Total comprehensive income (loss) 0.1 (14.4)  
Consolidating Adjustments [Member]      
Revenue, Net [Abstract]      
Related parties 0.0 0.0  
Other customers 0.0 0.0  
Total net sales 0.0 0.0  
Cost of goods sold 0.0 0.0  
Gross profit 0.0 0.0  
Selling, general and administrative expenses 0.0 0.0  
Other operating expense, net 0.0 0.0  
Operating income 0.0 0.0  
Interest expense 0.0 0.0  
Intercompany interest 0.0 0.0  
Interest income 0.0 0.0  
Net gain (loss) on forward and derivative contracts 0.0 0.0  
Other income (expense) - net 0.0 0.0  
Loss before income taxes and equity in earnings of joint ventures 0.0 0.0  
Income tax (expense) benefit 0.0 0.0  
Loss before equity in earnings of joint ventures 0.0 0.0  
Equity in earnings (loss) of joint ventures (4.9) 9.4  
Net loss (4.9) 9.4  
Other comprehensive income (loss) before income tax effect (1.1) (1.7)  
Income tax effect 0.0 0.0  
Other comprehensive income (1.1) (1.7)  
Total comprehensive income (loss) (6.0) 7.7  
The Company [Member] | Reportable Legal Entities [Member]      
Revenue, Net [Abstract]      
Related parties 0.0 0.0  
Other customers 0.0 0.0  
Total net sales 0.0 0.0  
Cost of goods sold 0.0 0.0  
Gross profit 0.0 0.0  
Selling, general and administrative expenses 10.0 10.2  
Other operating expense, net 0.0 0.0  
Operating income (10.0) (10.2)  
Interest expense (5.1) (5.2)  
Intercompany interest 9.0 9.0  
Interest income 0.2 0.1  
Net gain (loss) on forward and derivative contracts 0.0 0.0  
Other income (expense) - net 0.5 0.8  
Loss before income taxes and equity in earnings of joint ventures (5.4) (5.5)  
Income tax (expense) benefit (0.1) 0.6  
Loss before equity in earnings of joint ventures (5.5) (4.9)  
Equity in earnings (loss) of joint ventures 5.2 (10.2)  
Net loss (0.3) (15.1)  
Other comprehensive income (loss) before income tax effect 0.8 1.8  
Income tax effect (0.4) (1.1)  
Other comprehensive income 0.4 0.7  
Total comprehensive income (loss) $ 0.1 (14.4)  
Combined Guarantor Subsidiaries [Member]      
Condensed Statement of Income Captions [Line Items]      
Ownership percentage 100.00%    
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]      
Revenue, Net [Abstract]      
Related parties $ 110.7 131.1  
Other customers 157.5 85.2  
Total net sales 268.2 216.3  
Cost of goods sold 261.2 213.8  
Gross profit 7.0 2.5  
Selling, general and administrative expenses 0.0 0.0  
Other operating expense, net 0.0 0.0  
Operating income 7.0 2.5  
Interest expense (0.4) (0.4)  
Intercompany interest 2.3 2.1  
Interest income 0.0 0.0  
Net gain (loss) on forward and derivative contracts 0.3 (15.8)  
Other income (expense) - net 0.0 0.0  
Loss before income taxes and equity in earnings of joint ventures 9.2 (11.6)  
Income tax (expense) benefit 0.0 0.5  
Loss before equity in earnings of joint ventures 9.2 (11.1)  
Equity in earnings (loss) of joint ventures (0.3) 0.8  
Net loss 8.9 (10.3)  
Other comprehensive income (loss) before income tax effect 0.7 1.3  
Income tax effect 0.0 0.0  
Other comprehensive income 0.7 1.3  
Total comprehensive income (loss) 9.6 (9.0)  
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]      
Revenue, Net [Abstract]      
Related parties 185.5 149.5  
Other customers 0.8 0.0  
Total net sales 186.3 149.5  
Cost of goods sold 178.8 135.1  
Gross profit 7.5 14.4  
Selling, general and administrative expenses 0.7 0.5  
Other operating expense, net 0.3 1.0  
Operating income 6.5 12.9  
Interest expense 0.0 0.0  
Intercompany interest (11.3) (11.1)  
Interest income 0.3 0.1  
Net gain (loss) on forward and derivative contracts 0.4 (0.3)  
Other income (expense) - net (1.6) (0.4)  
Loss before income taxes and equity in earnings of joint ventures (5.7) 1.2  
Income tax (expense) benefit 1.1 (0.8)  
Loss before equity in earnings of joint ventures (4.6) 0.4  
Equity in earnings (loss) of joint ventures 0.6 0.5  
Net loss (4.0) 0.9  
Other comprehensive income (loss) before income tax effect 0.4 0.4  
Income tax effect 0.0 0.0  
Other comprehensive income 0.4 0.4  
Total comprehensive income (loss) $ (3.6) $ 1.3