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Inventories - Component of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 47.6 $ 56.8
Work in progress 24.0 26.8
Finished goods 39.7 36.3
Total inventories $ 111.3 $ 119.9