Other Financial Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income taxes paid (collected), net	$ 26.9	$ 17.4	$ 51.7
Interest paid, net of amounts capitalized	$ 56.6	$ 50.4	$ 41.5