Earnings per Share (Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share) (Details) - shares	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Basic method (in shares)	168,537,896	173,042,626	[1]	170,555,685	172,907,537	[1]
Dilutive stock options and restricted stock units (in shares)	734,567	939,994		877,007	2,019,525
Diluted method (in shares)	169,272,463	173,982,620	[1]	171,432,692	174,927,062	[1]

[1] Reclassified to conform to current presentation (see Note A).