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Accumulated Other Comprehensive Income - Noncontrolling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance     $ (16.4)  
Net income $ 3.5 $ 3.9 6.5 $ 5.1
Translation adjustments     4.7  
Postretirement plans     (4.3)  
Ending balance $ (9.5)   $ (9.5)