Planned Separation Transaction (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Planned Separation Transaction [Abstract]
Separation costs	$ 0.0	$ 9.4	$ 27.1	$ 9.4