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Revenues (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenue Disaggregation |  |  |
Revenue | $ 11,534.5 |  |
Revenue from sales of metal products (as a percent) | 94.00% |  |
Number of performance obligations from sales of metal products | item | 1 |  |
Shipping and handling costs included in operating expenses | $ 412.7 | $ 372.3 | $ 346.2
Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | 9,721.0 | 8,613.4
Carbon steel |  |  |
Revenue Disaggregation |  |  |
Revenue | 6,285.8 |  |
Carbon steel | Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | 5,189.6 | 4,579.5
Aluminum |  |  |
Revenue Disaggregation |  |  |
Revenue | 2,210.9 |  |
Aluminum | Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | 1,916.9 | 1,777.6
Stainless steel |  |  |
Revenue Disaggregation |  |  |
Revenue | 1,636.1 |  |
Stainless steel | Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | 1,386.3 | 1,212.5
Alloy |  |  |
Revenue Disaggregation |  |  |
Revenue | 680.7 |  |
Alloy | Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | 587.8 | 473.3
Toll processing and logistics |  |  |
Revenue Disaggregation |  |  |
Revenue | $ 415.3 |  |
Number of days to perform services | 1 day |  |
Toll processing and logistics | Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | 362.1 | 326.5
Other |  |  |
Revenue Disaggregation |  |  |
Revenue | $ 305.7 |  |
Other | Before adoption of ASU 2014-09 |  |  |
Revenue Disaggregation |  |  |
Revenue |  | $ 278.3 | $ 244.0

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