CONSOLIDATED STATEMENT OF EQUITY (Parenthetical) - shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Stock incentive programs and related tax withholdings, shares	0.2	0.3	0.6
Purchase of common stock, shares	0.0	2.2	3.0