Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Weighted average shares excluded from denominator for diluted earnings per share because the stock options were anti-dilutive	1.6	0.7	1.4	0.6
Restricted stock units issued under stock incentive plan	0.0	0.0	1.3	0.5
Restricted stock units excluded from the denominator for diluted earnings per share			0.3	0.2