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Segment and Geographical Area Information Segment and Geographical Area Information, Schedule of net sales, income taxes paid, and long-lived assets, by geographical area (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers | $ 316.6 | $ 336.4 | $ 367.2 | $ 371.7 | $ 338.0 | $ 338.9 | $ 344.1 | $ 335.1 | $ 1,391.9 | $ 1,356.1 | $ 1,297.5
Income taxes paid |  |  |  |  |  |  |  |  | 2.3 | 3.5 | 2.1
Long-lived assets | 495.4 |  |  |  | 454.9 |  |  |  | 495.4 | 454.9 |
Fabricated Products |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 1,391.9 | 1,356.1 | 1,297.5
Long-lived assets | 490.5 |  |  |  | 450.0 |  |  |  | 490.5 | 450.0 |
Fabricated Products | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 1,321.3 | 1,254.0 | 1,204.7
Income taxes paid |  |  |  |  |  |  |  |  | 0.6 | 2.1 | 1.2
Long-lived assets | 459.6 |  |  |  | 432.6 |  |  |  | 459.6 | 432.6 |
Fabricated Products | Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 70.6 | 102.1 | 92.8
Income taxes paid |  |  |  |  |  |  |  |  | 1.7 | 1.4 | $ 0.9
Long-lived assets | 30.9 |  |  |  | 17.4 |  |  |  | 30.9 | 17.4 |
All Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 4.9 |  |  |  | 4.9 |  |  |  | 4.9 | 4.9 |
All Other | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 4.9 |  |  |  | $ 4.9 |  |  |  | $ 4.9 | $ 4.9 |

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