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Business, Product and Geographical Area Information and Concentration of Risk (Tables) | 9 Months Ended
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Sep. 30, 2018
Segment Reporting [Abstract] |
Schedule of net sales by end market segment applications | Net sales by end market applications and by timing of control transfer for each period presented were as follows (in millions of dollars):
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net sales: |  |  |  |  |  |  |
Aero/HS products | $ | 185.7 |  |  | $ | 150.2 |  |  | $ | 540.9 |  |  | $ | 483.2 |
Automotive Extrusions | 56.1 |  |  | 52.7 |  |  | 183.9 |  |  | 161.6 |
GE products | 133.9 |  |  | 115.9 |  |  | 425.1 |  |  | 361.1 |
Other products | 17.4 |  |  | 14.0 |  |  | 46.6 |  |  | 38.5 |
Total net sales | $ | 393.1 |  |  | $ | 332.8 |  |  | $ | 1,196.5 |  |  | $ | 1,044.4 |
Timing of revenue recognition – Note 9: |  |  |  |  |  |  |
Products transferred at a point in time | $ | 127.8 |  |  | n/a |  |  | $ | 425.2 |  |  | n/a |
Products transferred over time | 265.3 |  |  | n/a |  |  | 771.3 |  |  | n/a |
Total net sales | $ | 393.1 |  |  |  |  | $ | 1,196.5 |  |  |
Schedule of income taxes paid by geographical area | Geographic information for income taxes paid for each period presented was as follows (in millions of dollars):
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Income taxes paid: |  |  |  |  |  |  |
Domestic | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 1.3 |  |  | $ | 0.7 |
Foreign | — |  |  | — |  |  | 2.0 |  |  | 0.1 |
Total income taxes paid | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 3.3 |  |  | $ | 0.8 |
Schedule of information for contractual delivery of primary aluminum supply from major suppliers | Information for delivery of our primary aluminum supply from our major suppliers for each period presented was as follows:
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Percentage of total primary aluminum supply (lbs): |  |  |  |  |  |  |
Supply from our top five major suppliers | 83 | % |  | 86 | % |  | 82 | % |  | 86 | %
Supply from our largest supplier | 33 | % |  | 35 | % |  | 36 | % |  | 36 | %
Supply from our second and third largest suppliers combined | 36 | % |  | 35 | % |  | 32 | % |  | 33 | %

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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