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Discontinued Operations - Results of Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue   $ 2,461.4   $ 7,154.7
Transformation costs   113.0   195.2
Earnings (loss) before income taxes   179.2   604.6
Income tax expense (benefit)   41.2   172.8
Income (loss) from discontinued operations 12.2 138.0 5.3 431.8
Exelis [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue   1,522.4   4,354.5
Transformation costs   11.0   23.4
Earnings (loss) before income taxes   152.5   409.1
Income tax expense (benefit)   52.7   142.4
Income (loss) from discontinued operations   99.8   266.7
Xylem [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue   939.0   2,800.2
Transformation costs   45.8   66.7
Earnings (loss) before income taxes   72.4   294.2
Income tax expense (benefit)   17.5   74.3
Income (loss) from discontinued operations   54.9   219.9
Other [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Transformation costs   56.2   105.1
Earnings (loss) before income taxes   (45.7)   (98.7)
Income tax expense (benefit)   (29.0)   (43.9)
Income (loss) from discontinued operations   $ (16.7)   $ (54.8)