Related Party Transactions - Construction Management Firm and CCI (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earn-Out Liabilities
Related Party Transaction [Line Items]
Acquisition-related contingent consideration liabilities, payments	$ 47.0	$ 50.4	$ 35.0
Construction Management Firm Specializing in Steel Building Systems \| Immediate Family Member of Management \| Earn-Out Liabilities
Related Party Transaction [Line Items]
Acquisition-related contingent consideration liabilities, payments	0.8
CCI \| Immediate Family Member of Management \| Equipment
Related Party Transaction [Line Items]
Payments, net of rebates, related party	23.2	6.8	$ 41.7
Payables, related party	0.8	4.2
Revenue, related party	0.1	$ 0.9
Receivables, related party	$ 0.0

Amount for accounts payable to related parties.

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