Contract Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Retainage receivable estimated by management to be collected beyond one year, percentage	47.00%		47.00%
Capitalized contract costs amortized and recognized as expense	$ 13.7	$ 11.3	$ 45.3	$ 36.6
Retainage payable estimated by management to be remitted beyond one year, percentage	43.00%		43.00%
Liability revenue recognized from contract with customer	$ 447.4	$ 288.0	$ 487.1	$ 608.4