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Summary of Significant Accounting Policies - Business, Fair Value, and Goodwill (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) item | Dec. 31, 2013 USD ($)
Summary of Significant Accounting Policies |  |  |
Minimum number of locations in which company operates metal service network | item | 300 |  |
Number of states in which the company operates metal service center network | item | 39 |  |
Number of countries in which entity operates | item | 12 |  |
Minimum number of metal products distributes by the company | item | 100,000 |  |
Fair Values of Financial Instruments |  |  |
Carrying value, before deducting unamortized discount or premiums | $ | $ 1,942.1 | $ 2,319.1 |
Carrying value | $ | $ 1,942.1 |  |
Goodwill Policy |  |  |
Number of operating segments | item | 1 |  |
Number of reportable segments | item | 1 | 1 |
Impairment of goodwill | $ | $ 0.0 | $ 0.0 | $ 0.0
Senior Unsecured Notes |  |  |
Fair Values of Financial Instruments |  |  |
Carrying value, before deducting unamortized discount or premiums | $ | 1,100.0 |  |
Fair value | $ | 1,080.0 | 1,160.0 |
Carrying value | $ | $ 1,090.0 | $ 1,090.0 |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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