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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
SentrySafe
Sep. 30, 2014
Minimum
Tradenames and Customer Relationship
Sep. 30, 2014
Maximum
Tradenames and Customer Relationship
Goodwill And Intangible Assets [Line Items]          
Goodwill $ 1,455.6 [1] $ 1,433.8 [1]      
Goodwill increase due to acquisition     21.8    
Identifiable intangible assets, tradenames 665.9 630.0      
Increase in gross amortizable identifiable intangible assets acquired     $ 45.4    
Amortizable identifiable intangible assets, estimated useful life       5 years 30 years
[1] Net of accumulated impairment losses of $489.6 million ($399.5 million in the Doors segment and $90.1 million in the Security & Storage segment).