SHAREHOLDERS' EQUITY (SCHEDULE OF EARNINGS PER SHARE RECONCILIATION) (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Net income (loss) for diluted earnings per share	$ 358.2	$ 270.7	$ 51.4
Shares:
Weighted average shares outstanding for basic earnings per share (in dollars per share)	176,638	193,054	212,917
Effect of dilutive securities on weighted average shares:
Stock options, restricted stock and performance units (in shares)	1,685	2,112	2,505
Warrants (in shares)	0	0	2,233
Dilutive potential common shares (in shares)	1,685	2,112	4,738
Weighted average shares outstanding for diluted earnings per share (in shares)	178,323	195,166	217,655