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Summary of Changes in Restructuring Reserves (Detail) (Employee Severance, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Employee Severance
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance   $ 1.0
Payments   (0.1)
Adjustments 0.6 (0.6)
Beginning Balance $ 0.3 $ 0.3