Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 1,191.8	$ 949.2	$ 2,270.2	$ 2,039.5
Electrical Solutions
Disaggregation of Revenue [Line Items]
Net Sales	602.9	469.4	1,149.1	1,033.1
Electrical Solutions | Commercial and Industrial
Disaggregation of Revenue [Line Items]
Net Sales	423.6	312.5	802.1	693.5
Electrical Solutions | Heavy Industrial
Disaggregation of Revenue [Line Items]
Net Sales	85.8	67.2	162.1	153.5
Electrical Solutions | Residential and Retail
Disaggregation of Revenue [Line Items]
Net Sales	93.5	89.7	184.9	186.1
Electrical Solutions | United States
Disaggregation of Revenue [Line Items]
Net Sales	534.0	424.2	1,022.0	931.5
Electrical Solutions | International
Disaggregation of Revenue [Line Items]
Net Sales	68.9	45.2	127.1	101.6
Utility Solutions
Disaggregation of Revenue [Line Items]
Net Sales	588.9	479.8	1,121.1	1,006.4
Utility Solutions | Utility T&D Components
Disaggregation of Revenue [Line Items]
Net Sales	421.3	337.5	796.2	692.4
Utility Solutions | Utility Communications and Controls
Disaggregation of Revenue [Line Items]
Net Sales	167.6	142.3	324.9	314.0
Utility Solutions | United States
Disaggregation of Revenue [Line Items]
Net Sales	560.3	456.5	1,061.7	954.4
Utility Solutions | International
Disaggregation of Revenue [Line Items]
Net Sales	$ 28.6	$ 23.3	$ 59.4	$ 52.0