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Accumulated Other Comprehensive Income - Noncontrolling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance     $ (16.4)  
Net income (loss) $ (11.8) $ 3.1 (5.3) $ 8.2
Translation adjustments     6.9  
Postretirement plans     (6.9)  
Ending balance $ (21.7)   $ (21.7)