Other Financial Information (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash income taxes paid (collected), net of refunds	$ 66.5	$ 16.2
Interest paid, net of amounts capitalized	$ 39.0	$ 46.0