Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 1,811.8	$ 1,784.4
Current year acquisitions	99.7	29.4
Dispositions		(3.1)
Prior year acquisitions	3.1
Foreign currency translation	8.7	1.1
Goodwill, end of period	1,923.3	1,811.8
Electrical Solutions
Goodwill [Roll Forward]
Goodwill, beginning of period	727.7	714.1
Current year acquisitions	21.1	15.2
Dispositions		(3.1)
Prior year acquisitions	0.5
Foreign currency translation	3.1	1.5
Goodwill, end of period	752.4	727.7
Utility Solutions
Goodwill [Roll Forward]
Goodwill, beginning of period	1,084.1	1,070.3
Current year acquisitions	78.6	14.2
Dispositions		0.0
Prior year acquisitions	2.6
Foreign currency translation	5.6	(0.4)
Goodwill, end of period	$ 1,170.9	$ 1,084.1