Contract Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retainage receivable estimated by management to be collected beyond one year, percentage	55.00%
Costs and estimated earnings in excess of billings	$ 642.6
Capitalized contract costs amortized and recognized as expense	$ 10.8	$ 12.6
Retainage payable estimated by management to be remitted beyond one year, percentage	39.00%
Liability revenue recognized from contract with customer	$ 365.1	$ 317.8