EARNINGS PER SHARE (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Convertible subordinated debt [Member]	May 30, 2014 Convertible subordinated debt [Member]
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Net income (loss) for basic earnings per share	$ 117.4	$ 283.0	$ (32.5)	$ 372.0
Add: interest expense on 7.0% Senior Debentures due 2016 (the 7.0% Debentures), net of income taxes	0	0	0	1.6
Interest rate					7.00%	7.00%
Net income (loss) for diluted earnings per share	$ 117.4	$ 283.0	$ (32.5)	$ 373.6
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	210,525	222,876	215,790	221,819
Effect of dilutive securities on weighted average shares:
7.0% Debentures (in shares)	0	839	0	7,707
Stock options, restricted stock and performance units (in shares)	2,447	2,858	0	2,699
Warrants (in shares)	2,486	2,774	0	2,344
Dilutive potential common shares (in shares)	4,933	6,471	0	12,750
Weighted average shares outstanding for diluted earnings per share (in shares)	215,458	229,347	215,790	234,569