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Summary of Significant Accounting Policies - Revenue Recognition, Share-Based Compensation and Foreign Currencies (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Revenue Recognition |  |  |
Number of performance obligations from sales of metal products | item | 1 |  |
Shipping and handling costs included in operating expenses | $ 424.6 | $ 357.4 | $ 404.1
Share-Based Compensation |  |  |
Stock-based compensation expense | 70.8 | 42.2 | 51.2
Foreign Currencies |  |  |
Net gain (loss) resulting from foreign currency transactions | $ (4.0) | $ (2.3) | $ (4.1)
Toll processing |  |  |
Revenue Recognition |  |  |
Number Of Days To Perform Services | 1 day |  |

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