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Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]    
Opening balance at January 1, 2014 $ 13.0  
Reductions for tax positions of prior periods (4.0)  
Closing balance at March 31, 2014 9.0  
Current 0 6.8
Non-current 9.0 6.2
Interest and Penalties [Member]
    
Income Tax Contingency [Line Items]    
Opening balance at January 1, 2014 1.1  
Reductions for tax positions of prior periods (0.4)  
Closing balance at March 31, 2014 0.7  
Current 0  
Non-current 0.7  
Unrecognized Tax Benefits [Member]
    
Income Tax Contingency [Line Items]    
Opening balance at January 1, 2014 11.9  
Reductions for tax positions of prior periods (3.6)  
Closing balance at March 31, 2014 8.3  
Current 0  
Non-current $ 8.3