Contract Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retainage receivable estimated by management to be collected beyond one year, percentage	54.00%
Costs and estimated earnings in excess of billings	$ 549.0
Capitalized contract costs were amortized and recognized as expense	$ 56.9	$ 57.1	$ 47.3
Retainage payable estimated by management to be remitted beyond one year, percentage	46.00%
Revenue recognized	$ 740.3	$ 533.5	$ 638.7