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Unconsolidated Investments (Schedule of Interest Income and Foreign Currency Gain) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]    
Income from unconsolidated investments $ 2.1 $ 2.5
Foreign currency translation gain (loss) 0.2 (3.9)
Total $ 2.3 $ (1.4)