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COMPREHENSIVE INCOME (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income$ 5.7$ 13.6$ 70.1$ 98.3
Other comprehensive loss, after tax(6.0)(3.0)(6.4)(6.4)
Total comprehensive income (loss)$ (0.3)$ 10.6$ 63.7$ 91.9