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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) (Parentheticals) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Other Comprehensive Income [Abstract]        
Other comprehensive income (loss), Unrealized gain (loss) on derivatives, Income tax benefit (expense)   $ 0.9 $ 4.8 $ 3.1
Other comprehensive income (loss), Reclassification adjustment on derivatives, Income tax benefit (expense) $ 3.1 $ 1.1 $ 3.9 $ 3.8