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Restructuring - Summary of Changes in Restructuring Reserves (Detail) (Employee Severance, USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Employee Severance
     
Restructuring Reserve [Roll Forward]      
Beginning Balance $ 0.6 $ 1.0 $ 1.5
Payments (0.3) (0.5) (0.3)
Adjustments 0.1 0.1 (0.2)
Beginning Balance $ 0.4 $ 0.6 $ 1.0