Annual report pursuant to Section 13 and 15(d)

Scheduled Future Maturities of Debt (Detail)

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Scheduled Future Maturities of Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
2012 $ 46.6  
2013 15.1  
2014 290.0  
2015     
2016     
Thereafter 647.5  
Total debt $ 999.2 $ 990.2