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Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 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    
Closing balance at March 31, 2016 3.9    
Current   $ 0.0  
Non-current   3.9 $ 3.9
Unrecognized tax benefits 3.9 3.9 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    
Closing balance at March 31, 2016 3.6    
Current   0.0  
Non-current   3.6  
Unrecognized tax benefits 3.6 3.6 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    
Closing balance at March 31, 2016 0.3    
Current   0.0  
Non-current   0.3  
Unrecognized tax benefits $ 0.3 $ 0.3 $ 0.3