Consolidated Statements of Total Equity Consolidated Statements of Total Equity (Parenthetical) - shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Beginning Balances, shares			376,261,635
Ending Balances, shares	369,748,212
Common Stock, par value $.01 per share
Beginning Balances, shares	373,132,964	373,242,060	376,261,635	377,409,517	375,693,966	374,986,079
Exercise of stock options	271,186	831,489	806,817	185,389	1,046,210	916,913
Stock issued under employee benefit plans	2,524	1,059,415	273,608	6,796	1,169,341	290,974
Repurchases of common stock	(3,658,462)	(2,000,000)	(4,100,000)	(608,537)	(500,000)	(500,000)
Ending Balances, shares	369,748,212	373,132,964	373,242,060	376,993,165	377,409,517	375,693,966