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Business, Product and Geographical Area Information and Concentration of Risk - 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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 389.4 | $ 393.1 | $ 415.4 | $ 388.0 | $ 353.1 | $ 332.8 | $ 356.3 | $ 355.3 | $ 1,585.9 | $ 1,397.5 | $ 1,330.6
Income taxes paid |  |  |  |  |  |  |  |  | 3.6 | 1.3 | 1.2
Long-lived assets | 611.8 |  |  |  | 571.4 |  |  |  | 611.8 | 571.4 | 530.9
Fabricated Products | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,509.6 | 1,337.3 | 1,278.6
Income taxes paid |  |  |  |  |  |  |  |  | 1.6 | 1.2 | 0.7
Long-lived assets | 581.7 |  |  |  | 541.2 |  |  |  | 581.7 | 541.2 | 499.5
Fabricated Products | Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 76.3 | 60.2 | 52.0
Income taxes paid |  |  |  |  |  |  |  |  | 2.0 | 0.1 | 0.5
Long-lived assets | $ 30.1 |  |  |  | $ 30.2 |  |  |  | $ 30.1 | $ 30.2 | $ 31.4

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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