Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) group	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Operating Income	$ 120.9	$ 99.6
Operating Income as a % of Net Sales	11.10%	10.00%
Total net sales	$ 1,087.3	$ 991.2
Electrical
Segment Reporting Information [Line Items]
Number of business groups (in groups) | group	3
Operating Income	$ 68.6	$ 61.2
Operating Income as a % of Net Sales	10.90%	9.90%
Total net sales	$ 630.2	$ 618.1
Power
Segment Reporting Information [Line Items]
Operating Income	$ 52.3	$ 38.4
Operating Income as a % of Net Sales	11.40%	10.30%
Total net sales	$ 457.1	$ 373.1