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Summary of Significant Accounting Policies, Narrative, Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment |  |  |
Interest expense capitalized as construction in progress | $ 2.9 | $ 1.8 | $ 2.5
Depreciation expense | 34.5 | 30.8 | 29.5
Non-cash impairment charges | 2.8 | 0.1 | 1.5
Fabricated Products | Idled equipment |  |  |
Property, Plant and Equipment |  |  |
Non-cash impairment charges | $ 0.2 | $ 0.1 | $ 1.5
Minimum | Land improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 3 years |  |
Minimum | Buildings and leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 15 years |  |
Minimum | Machinery and equipment |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 1 year |  |
Minimum | Capital lease assets |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 3 years |  |
Maximum | Land improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 25 years |  |
Maximum | Buildings and leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 45 years |  |
Maximum | Machinery and equipment |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 24 years |  |
Maximum | Capital lease assets |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment useful lives (in years) | 5 years |  |

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