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Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]    
Opening balance at January 1, 2015 $ 6.2  
Additions for prior period tax positions 0.1  
Additions for current period tax positions 1.2  
Reductions due to lapsed statutes of limitations (3.9)  
Closing balance at September 30, 2015 3.6  
Current 0.0  
Non-current 3.6 $ 6.2
Unrecognized Tax Benefits [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1, 2015 5.7  
Additions for prior period tax positions 0.0  
Additions for current period tax positions 1.2  
Reductions due to lapsed statutes of limitations (3.6)  
Closing balance at September 30, 2015 3.3  
Current 0.0  
Non-current 3.3  
Interest and Penalties [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1, 2015 0.5  
Additions for prior period tax positions 0.1  
Additions for current period tax positions 0.0  
Reductions due to lapsed statutes of limitations (0.3)  
Closing balance at September 30, 2015 0.3  
Current 0.0  
Non-current $ 0.3