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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax [Line Items]                  
Accumulated undistributed earnings of certain foreign subsidiaries $ 28.9       $ 28.0 $ 28.9 $ 28.0    
Deferred tax asset, federal net operating loss carryforwards 3.0       4.0 3.0 4.0    
Deferred tax asset, state net operating loss carryforwards 6.8       6.8 6.8 6.8    
Deferred tax asset, foreign net operating loss carryforwards 9.2       5.2 9.2 5.2    
Deferred tax asset, U.S. research tax credit carryforwards 1.1       1.5 1.1 1.5    
Deferred tax asset, U.S. foreign tax credits carryforwards 1.5       8.3 1.5 8.3    
Deferred tax asset, U.S. alternative minimum tax credits carryforwards 1.0       3.3 1.0 3.3    
Deferred Tax Asset, Valuation Allowance 7.7       5.9 7.7 5.9    
Total deferred tax assets 86.2       96.6 86.2 96.6    
Income taxes paid           13.3 9.6 $ 7.2  
Unrecognized tax benefits 1.8       2.2 1.8 2.2 2.0 $ 3.9
Unrecognized tax benefits that, interests 0.6       0.8 0.6 0.8    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 2.1       2.5 2.1 2.5    
Decrease in valuation allowance 2.2             3.5  
Income tax expense (benefit)         (1.4) $ 17.4 $ 34.1 $ 23.7  
Effective Income Tax Rate Reconciliation, Percent           30.60% 34.10% 28.40%  
Benefit associated with tax planning strategy         (4.2)   $ 4.2    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 0.2 $ 0.4 $ 0.4 $ 0.5 2.4   2.4    
Unrecognized tax benefits, period increase (decrease)               $ (1.0)  
Change in enacted tax rate         $ 0.4   0.4 $ 0.4  
Research Tax Credit Carryforward                  
Income Tax [Line Items]                  
Deferred tax asset, tax credit carryforwards expiration year           2019      
Canada                  
Income Tax [Line Items]                  
Decrease in valuation allowance 3.5                
Internal Revenue Service (IRS)                  
Income Tax [Line Items]                  
Deferred tax asset, net operating loss carryforwards expiration year           2027      
State and Local Jurisdiction                  
Income Tax [Line Items]                  
Deferred tax asset, net operating loss carryforwards expiration year           2017      
Foreign Tax Authority                  
Income Tax [Line Items]                  
Deferred tax asset, net operating loss carryforwards expiration year           2025      
Deferred tax asset, tax credit carryforwards expiration year           2023      
Decrease in valuation allowance (1.9)                
UNITED KINGDOM                  
Income Tax [Line Items]                  
Deferred Tax Asset, Valuation Allowance 5.8         $ 5.8      
Decrease in valuation allowance $ (1.3)                
Current Deferred Tax Assets [Member]                  
Income Tax [Line Items]                  
Unrecognized tax benefits, period increase (decrease)           $ (0.3) $ (0.5)