Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) group	Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Total net sales	$ 1,204.0	$ 1,179.7	$ 3,487.7	$ 3,337.6
Operating Income	$ 172.9	$ 163.8	$ 460.7	$ 420.3
Operating Income as a % of Net Sales	14.40%	13.90%	13.20%	12.60%
Electrical
Segment Reporting Information [Line Items]
Number of business groups (in groups) | group			3
Total net sales	$ 689.3	$ 687.4	$ 2,007.7	$ 1,994.1
Operating Income	$ 90.2	$ 94.0	$ 246.8	$ 246.5
Operating Income as a % of Net Sales	13.10%	13.70%	12.30%	12.40%
Power
Segment Reporting Information [Line Items]
Total net sales	$ 514.7	$ 492.3	$ 1,480.0	$ 1,343.5
Operating Income	$ 82.7	$ 69.8	$ 213.9	$ 173.8
Operating Income as a % of Net Sales	16.10%	14.20%	14.50%	12.90%