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Redeemable Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Redeemable Noncontrolling Interest    
Balance at beginning of period $ 227.2 $ 243.4
Change in related noncontrolling interests balance (4.9) (8.3)
Changes in redemption value of redeemable noncontrolling interests    
Additions 12.5 3.0
Redemptions and other (2.1) (14.2)
Redemption value adjustments (3.1) [1] (3.6) [1]
Balance at end of period $ 229.6 $ 220.3
[1] Redeemable noncontrolling interests are reported at their estimated redemption value in each reporting period, but not less than their initial fair value. Any adjustment to the redemption value impacts retained earnings or additional paid-in capital, except adjustments as a result of currency translation.