Contract Assets And Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Contract Assets and Liabilities [Abstract]
Capitalized contract costs were amortized and recognized as expense	$ 10.3	$ 5.7
Contract with Customer, Liability, Revenue Recognized	$ 429.5	$ 301.0