ACCUMULATED OTHER COMPREHENSIVE INCOME: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Amounts Reclassified from Accumulated Other Comprehensive (loss)
Income before taxes	$ 24.9	$ 120.3
Income tax provision	8.0	30.6
Net Income (Loss) Available to Common Stockholders, Basic	18.9	75.8
Total reclassifications for the period	(3.2)
Amount Reclassified from Accumulated Other Comprehensive Loss
Amounts Reclassified from Accumulated Other Comprehensive (loss)
Income before taxes	(4.4)
Income tax provision	(1.2)
Net Income (Loss) Available to Common Stockholders, Basic	(3.2)
Pension related adjustments | Amount Reclassified from Accumulated Other Comprehensive Loss
Amounts Reclassified from Accumulated Other Comprehensive (loss)
Actuarial losses	(4.2)
Prior service costs	$ (0.2)