Goodwill and Other Intangible Assets, net - Changes in Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2019	$ 1,811.8
Prior year acquisitions	3.7
Foreign currency translation	(6.8)
BALANCE JUNE 30, 2020	1,808.7
Electrical
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2019	727.7
Prior year acquisitions	0.3
Foreign currency translation	(3.0)
BALANCE JUNE 30, 2020	725.0
Utility Solutions
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2019	1,084.1
Prior year acquisitions	3.4
Foreign currency translation	(3.8)
BALANCE JUNE 30, 2020	$ 1,083.7