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Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Goodwill [Line Items]  
Goodwill Beginning Balance $ 6,920.1
Addition from acquisitions 80.9
Foreign currency translation 64.2
Goodwill Ending Balance 7,065.2
Construction and Do It Yourself
 
Goodwill [Line Items]  
Goodwill Beginning Balance 3,004.2
Foreign currency translation 37.6
Goodwill Ending Balance 3,041.8
Industrial Segment
 
Goodwill [Line Items]  
Goodwill Beginning Balance 1,291.4
Addition from acquisitions 60.2
Foreign currency translation 5.0
Goodwill Ending Balance 1,356.6
Securities Industry
 
Goodwill [Line Items]  
Goodwill Beginning Balance 2,624.5
Addition from acquisitions 20.7
Foreign currency translation 21.6
Goodwill Ending Balance $ 2,666.8