Earnings Per Share (Narrative) (Details) - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	0.4	6.0	0.5	4.5
Antidilutive securities excluded from computation of earnings per share, exercise price, lower range limit	$ 52.32	$ 52.32	$ 52.32	$ 52.32
Antidilutive securities excluded from computation of earnings per share, exercise price, upper range limit	$ 76.49	$ 76.49	$ 76.49	$ 76.49