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, 2012
Dec. 31, 2011
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (176.3) $ (176.4)
Pension Benefits
   
Amounts recognized in the statements of financial position consist of:    
Current liabilities (3.7) (3.8)
Long-term liabilities (165.1) (159.3)
Net amount recognized (168.8) (163.1)
Other Benefits
   
Amounts recognized in the statements of financial position consist of:    
Current liabilities 0 0
Long-term liabilities (5.9) (10.6)
Net amount recognized $ (5.9) $ (10.6)