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Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Opening balance at January 1, 2016 $ 3.9    
Additions for current period tax positions 0.0    
Reductions due to lapsed statute of limitations (0.4)    
Closing balance at June 30, 2016 3.5    
Current   $ 0.0  
Non-current   3.5 $ 3.9
Unrecognized tax benefits 3.5 3.5 3.9
Unrecognized Tax Benefits [Member]      
Income Tax Contingency [Line Items]      
Opening balance at January 1, 2016 3.6    
Additions for current period tax positions 0.0    
Reductions due to lapsed statute of limitations (0.4)    
Closing balance at June 30, 2016 3.2    
Current   0.0  
Non-current   3.2  
Unrecognized tax benefits 3.2 3.2 3.6
Interest and Penalties [Member]      
Income Tax Contingency [Line Items]      
Opening balance at January 1, 2016 0.3    
Additions for current period tax positions 0.0    
Reductions due to lapsed statute of limitations 0.0    
Closing balance at June 30, 2016 0.3    
Current   0.0  
Non-current   0.3  
Unrecognized tax benefits $ 0.3 $ 0.3 $ 0.3