Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common shares, shares authorized	1,000,000,000.0	1,000,000,000.0
Common shares, shares issued	237,600,000	229,800,000
Common shares, shares outstanding	237,600,000	229,800,000