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Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Noncontrolling interests    
Balance at beginning of period $ 6.8 $ 5.8
Net income   0.4
Foreign currency translation adjustments 0.2 (0.4)
Balance at end of period $ 7.0 $ 5.8