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Summary of Significant Accounting Policies - Summary of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 668.3us-gaap_InventoryRawMaterials $ 633.5us-gaap_InventoryRawMaterials
Work-in-process 45.6us-gaap_InventoryWorkInProcess 45.8us-gaap_InventoryWorkInProcess
Finished goods 139.8us-gaap_InventoryFinishedGoodsNetOfReserves 139.4us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 853.7us-gaap_InventoryNet $ 818.7us-gaap_InventoryNet