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Discontinued Operations Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Distribution of cash from nVent $ 993.6     $ 993.6 $ 0.0  
Gain from sale of discontinued operations, net of tax   $ 0.0 $ (1.7) 0.0 198.9 $ (181.1)
Discontinued Operations, Disposed of by Sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Distribution of cash from nVent           $ 3,150.0
Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Separation costs   $ 2.5 11.7 $ 82.4 19.3  
Deal related costs and expenses     $ 1.7   $ 55.4