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Redeemable Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Redeemable Noncontrolling Interests      
Balance at beginning of period $ 227.2 $ 243.4 $ 291.2
Change in related noncontrolling interest balance 4.6 1.1 (7.7)
Changes in redemption value of redeemable noncontrolling interests:      
Additions 16.2 0 17.9
Redemptions and reclassifications (2.3) (14.2) (70.7)
Redemption value adjustments 3.4 (3.1) 12.7
Balance at end of period $ 249.1 $ 227.2 $ 243.4