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Foreign Currency Forwards Purchase Contracts (Detail) (Foreign currency forward purchase contracts)
In Millions
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 17, 2011
USD ($)
Jun. 17, 2011
EUR (€)
Jun. 18, 2010
USD ($)
Dec. 31, 2010
USD ($)
Jun. 17, 2011
Group 1
EUR (€)
Jun. 17, 2011
Group 1
USD ($)
Jun. 18, 2010
Group 1
USD ($)
Dec. 31, 2010
Group 1
USD ($)
Jun. 17, 2011
Group 2
EUR (€)
Jun. 17, 2011
Group 2
USD ($)
Jun. 18, 2010
Group 2
USD ($)
Dec. 31, 2010
Group 2
USD ($)
Jun. 17, 2011
Group 3
EUR (€)
Jun. 17, 2011
Group 3
USD ($)
Jun. 18, 2010
Group 3
USD ($)
Dec. 31, 2010
Group 3
USD ($)
Jun. 17, 2011
Group 4
USD ($)
Jun. 17, 2011
Group 4
EUR (€)
Dec. 31, 2010
Group 4
USD ($)
Derivative [Line Items]                                      
Transaction Date Feb. 29, 2008 Feb. 29, 2008 Feb. 29, 2008 Feb. 29, 2008 May 31, 2008 May 31, 2008 Jul. 31, 2010 Jul. 31, 2010
Transaction Amount $ 114 € 80     € 30 $ 43     € 15 $ 22     € 15 $ 23     $ 26 € 20  
Forward Purchase Date Aug. 31, 2011 Aug. 31, 2011 Feb. 28, 2013 Feb. 28, 2013 May 31, 2014 May 31, 2014 Oct. 31, 2014 Oct. 31, 2014
Fair Value 1.3     6.9       2.8   1.2   2.2   2.2   2.9 (2.1)   (1.0)
Change in Fair Value $ (5.6)   $ 10.5     $ (2.8) $ 5.5     $ (1.0) $ 2.4     $ (0.7) $ 2.6   $ (1.1)