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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENTS OF EQUITY          
Net income attributable to the redeemable noncontrolling interest not included in equity $ 24.6 $ 26.6 $ 36.0 $ 32.0 $ 35.0