Goodwill and Other Intangible Assets, net - Changes in Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2019	$ 1,811.8
Prior year acquisitions	2.9
Foreign currency translation	(1.3)
BALANCE SEPTEMBER 30, 2020	1,813.4
Electrical
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2019	727.7
Prior year acquisitions	0.2
Foreign currency translation	(1.0)
BALANCE SEPTEMBER 30, 2020	726.9
Utility Solutions
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2019	1,084.1
Prior year acquisitions	2.7
Foreign currency translation	(0.3)
BALANCE SEPTEMBER 30, 2020	$ 1,086.5