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Industry Segments and Geographic Area Information - Narrative (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) group	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Concentration Risk [Line Items]
Net sales	$ 1,037.9	$ 1,108.6	$ 949.2	$ 1,090.3	$ 1,103.3	$ 1,204.0	$ 1,196.4	$ 1,087.3	$ 4,186.0	$ 4,591.0	$ 4,481.7
Operating Income									533.0	596.6	556.9
Export sales from United States									$ 237.9	$ 262.7	$ 261.9
Net Sales Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									8.00%	9.00%	10.00%
Long-lived assets Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									11.00%	11.00%	8.00%
Canada \| Net Sales Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									34.00%
Canada \| Long-lived assets Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									15.00%
United Kingdom \| Net Sales Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									28.00%
United Kingdom \| Long-lived assets Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									33.00%
Spain \| Long-lived assets Total \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage									22.00%
Electrical Solutions
Concentration Risk [Line Items]
Number of business groups \| group									3
Net sales									$ 2,263.6	$ 2,625.7	$ 2,660.6
Electrical Solutions \| Hubbell Gas Connectors and Accessories Business
Concentration Risk [Line Items]
Net sales									157.1
Operating Income									$ 19.4