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Noncontrolling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]        
Balance at December 31, 2015     $ 11.1  
Net income $ 3.9 $ 2.3 5.1 $ 4.5
Translation adjustments     (8.9)  
Postretirement plans     8.1  
Balance at March 31, 2016 $ 15.4   $ 15.4