Contract Assets And Liabilities (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Contract Assets and Liabilities [Abstract]
Costs and estimated earnings in excess of billings beyond one year	$ 465.8
Capitalized contract costs were amortized and recognized as expense	4.1
Contract with Customer, Liability, Revenue Recognized	$ 222.9