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Accumulated Other Comprehensive Income - Noncontrolling Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance     $ 28.2  
Net income $ 0.9 $ (11.8) 4.2 $ (5.3)
Translation adjustments     (1.3)  
Postretirement plans     1.1  
Ending balance $ 32.2   $ 32.2