CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	250,000.00	250,000.00
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000.0
Common stock, shares issued	162,800,000	162,800,000
Treasury stock, shares	23,000,000	21,900,000