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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Footnote) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]          
Income tax benefit on change in deferred gain (loss) on cash flow hedges       $ 0.8 $ 3.0
Income tax benefit (expense) on reclassification adjustment for losses on cash flow hedges $ (0.4) $ (0.2) $ (0.2) $ (3.6) $ 3.8