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Noncontrolling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Noncontrolling Interest [Line Items]        
Balance at December 31, 2014     $ 7.6  
Net income $ 2.0 $ 3.4 6.5 $ 9.7
Translation adjustments     (2.5)  
Postretirement plans     7.3  
Balance at September 30, 2015 $ 18.9   $ 18.9