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Related Party Transactions (Construction Management Firm and CCI) (Narrative) (Details) - Immediate Family Member of Management [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Construction Management Firm Specializing in Steel Building Systems [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payments to acquire businesses, gross |  |  | $ 6.1
Business combinations, contingent consideration, earn-out liabilities |  |  | 1.4
Advances outstanding, related party | $ 0.1 | $ 0.5 |
CCI [Member] | Equipment [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payments, net of rebates, related party | 6.8 | 41.7 | $ 57.6
Payables, related party | 4.2 | $ 0.2 |
Revenue, related party | $ 0.9 |  |

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