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Redeemable Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Redeemable Noncontrolling Interest, Equity, Fair Value [Abstract]    
Balance at beginning of period $ 249.1 $ 227.2
Change in related noncontrolling interests balance (4.5) (1.7)
Changes in redemption value of redeemable noncontrolling interests [Abstract]    
Additions 7.9 12.5
Redemptions and other (1.9) (1.3)
Redemption value adjustments (0.8) [1] (1.4) [1]
Balance at end of period $ 249.8 $ 235.3
[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.