Annual report pursuant to Section 13 and 15(d)

Net Amounts Recognized, or Funded Status of Pension and Other Postretirement Benefit Plans (Detail)

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Net Amounts Recognized, or Funded Status of Pension and Other Postretirement Benefit Plans (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (176.4) $ (129.0)
Pension Benefits
   
Amounts recognized in the statements of financial position consist of:    
Prepaid pension asset   4.0
Current liabilities (3.8) (3.8)
Long-term liabilities (159.3) (108.3)
Net amount recognized (163.1) (108.1)
Other Benefits
   
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities (10.6) (14.6)
Net amount recognized $ (10.6) $ (14.6)