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Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance, beginning of period     $ (1.0)  
Current period currency translation adjustments $ (1.4) $ (1.2) 1.3 $ (0.9)
Amortization of net actuarial gains, net of tax     (0.1)  
Balance, end of period 0.2   0.2  
Currency Translation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance, beginning of period     (6.0)  
Current period currency translation adjustments     1.2  
Balance, end of period (4.8)   (4.8)  
Pension Benefit Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance, beginning of period     5.0  
Current period currency translation adjustments     0.1  
Amortization of net actuarial gains, net of tax     (0.1)  
Balance, end of period $ 5.0   $ 5.0