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Redeemable Noncontrolling Interest (Details) (USD $)
In Millions
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Changes in redeemable noncontrolling interests    
Balance at beginning of period $ 291.2 $ 277.8
Change in related noncontrolling interest balance (10.2) (16.9)
Changes in redemption value of redeemable noncontrolling interests:    
Additions 5.5 21.0
Redemptions and reclassifications 25.4 16.7
Redemption value adjustments 11.0 [1] 4.2 [1]
Balance at end of period $ 272.1 $ 269.4
[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 additional paid-in capital, except adjustments as a result of currency translation.