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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Contingency [Line Items]            
Unrecognized tax benefits, interest and penalties $ 13.0   $ 13.0      
Unrecognized tax benefits 0.2          
Reduction in unrecognized tax benefits   0.5        
Cash payments for income taxes     21.1 13.1 18.1  
Operating loss carry forwards 0.3   0.3 0.3    
Operating loss carry forwards valuation allowance 0   0      
Foreign tax credit carry forwards 0   0 0 7.5 10.8
Unremitted earnings     605 717    
Foreign Income [Member]
            
Income Tax Contingency [Line Items]            
Foreign tax credit carry forwards $ 4.5   $ 4.5 $ 5.5