Earnings Per Share (Narrative) (Details) shares in Millions	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Potentially Dilutive Shares Excluded From EPS Calculation, Exercise Price | $ / shares	$ 29.34
RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Potentially Dilutive Shares Excluded From EPS Calculation	0.2
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Potentially Dilutive Shares Excluded From EPS Calculation	0.4