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Debt - Schedule of Debt Maturities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Maturities [Line Items]    
2013 $ 0  
2014 0  
2015 0  
2016 0  
2017 0  
Thereafter 300.0  
Total maturities 300.0  
Future accretion on Senior Notes (3.9)  
Total debt $ 296.1 $ 302.1