Accounts Receivable Sale Program (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounts Receivable Sale Program [Line Items]
Maximum Limit Accounts Receivable Sale Program			$ 80.0
Trade Accounts Receivable Sold	$ 40.0	$ 40.0	120.0	$ 105.0
Amount Received From Trade Accounts Receivable Sold To Third Party	$ 39.9	$ 39.9	$ 119.7	$ 104.8