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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers | $ 331.9 | $ 320.6 | $ 334.9 | $ 343.2 | $ 316.6 | $ 336.4 | $ 367.2 | $ 371.7 | $ 1,330.6 | $ 1,391.9 | $ 1,356.1
Income taxes paid |  |  |  |  |  |  |  |  | 1.2 | 2.3 | 3.5
Long-lived assets | 530.9 |  |  |  | 495.4 |  |  |  | 530.9 | 495.4 |
Fabricated Products |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 1,330.6 | 1,391.9 | 1,356.1
Long-lived assets | 526.1 |  |  |  | 490.5 |  |  |  | 526.1 | 490.5 |
Fabricated Products | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 1,278.6 | 1,321.3 | 1,254.0
Income taxes paid |  |  |  |  |  |  |  |  | 0.7 | 0.6 | 2.1
Long-lived assets | 494.7 |  |  |  | 459.6 |  |  |  | 494.7 | 459.6 |
Fabricated Products | Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  | 52.0 | 70.6 | 102.1
Income taxes paid |  |  |  |  |  |  |  |  | 0.5 | 1.7 | $ 1.4
Long-lived assets | 31.4 |  |  |  | 30.9 |  |  |  | 31.4 | 30.9 |
All Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 4.8 |  |  |  | 4.9 |  |  |  | 4.8 | 4.9 |
All Other | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 4.8 |  |  |  | $ 4.9 |  |  |  | $ 4.8 | $ 4.9 |

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