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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Total reclassifications $ (1.2)
Defined Benefit Pension Plan Items [Member]  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Total reclassifications (1.2)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Total reclassifications 1.2
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 (1.1)
Amortization of actuarial net losses 2.6
Total before tax 1.5
Income tax expense (0.3)
Total reclassifications $ 1.2