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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Liquidation of subsidiary $ 0.0 $ 0.0 $ 1.8 $ 0.0
Total reclassifications     (1.6)  
Foreign Currency Translation Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     0.0  
Defined Benefit Pension Plan Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     (1.6)  
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax     3.8  
Income tax expense     (0.4)  
Total reclassifications     3.4  
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | Foreign Currency Translation Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Liquidation of subsidiary     1.8  
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | Defined Benefit Pension Plan Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service credit     (0.5)  
Amortization of actuarial net losses     $ 2.5