Earnings Per Share (Narrative) (Details) - $ / shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	0.3	3.9	0.4	4.4
Antidilutive securities excluded from computation of earnings per share, exercise price, lower range limit	$ 52.32	$ 55.24	$ 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