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Accumulated Other Comprehensive Income - Noncontrolling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]    
Beginning balance $ (16.4)  
Net income 3.0 $ 1.2
Translation adjustments 1.3  
Postretirement plans (1.1)  
Ending balance $ (13.2)