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Segment Information, Textuals (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) productionfacilities | Jun. 30, 2014 USD ($) | Dec. 31, 2014
Segment Reporting Information |  |  |  |  |
Unrealized gains (losses) on derivatives |  |  | $ (6.0) | $ 4.9 |
Net periodic postretirement benefit cost relating to Salaried VEBA | $ 0.6 | $ (6.1) | 1.2 | (11.7) |
Pre-tax loss on settlement of Union VEBA |  | 0.0 |  |  |
Fabricated Products |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Unrealized gains (losses) on derivatives | $ (1.5) | $ 1.5 | $ (6.0) | $ 3.5 |
United States |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Number of production facilities | productionfacilities |  |  | 11 |  |
Canada |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Number of production facilities | productionfacilities |  |  | 1 |  |
Customer Concentration Risk | Largest Customer | Sales Revenue, Net | Fabricated Products |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage | 25.00% | 27.00% | 26.00% | 27.00% |
Customer Concentration Risk | Largest Customer | Accounts Receivable |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage |  |  | 20.00% |  | 10.00%
Customer Concentration Risk | Second Largest Customer | Sales Revenue, Net | Fabricated Products |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage | 10.00% |  | 10.00% |  |
Customer Concentration Risk | Second Largest Customer | Accounts Receivable |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 12.00%
VEBAs |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net periodic postretirement benefit cost relating to Salaried VEBA | $ 0.6 | $ (6.1) | $ 1.2 | $ (11.7) |
Pre-tax loss on settlement of Union VEBA | $ 1.6 | $ 0.0 | $ 493.8 | $ 0.0 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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