v2.4.0.6
Scheduled Vesting for Outstanding Restricted Stock Units (Detail) (Restricted Stock Units)
In Millions, unless otherwise specified
Dec. 31, 2012
Restricted Stock Units
 
Schedule of Vesting [Line Items]  
2013 4.8
2014 5.2
2015 3.2
2016 1.7
2017 0.3
Thereafter 0.2
Total 15.4