Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) group	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Operating Income	$ 166.9	$ 156.9	$ 287.8	$ 256.5
Operating Income as a % of Net Sales	14.00%	13.40%	12.60%	11.90%
Total net sales	$ 1,196.4	$ 1,166.7	$ 2,283.7	$ 2,157.9
Electrical
Segment Reporting Information [Line Items]
Number of business groups (in groups) | group			3
Operating Income	$ 88.0	$ 91.3	$ 156.6	$ 152.5
Operating Income as a % of Net Sales	12.80%	13.30%	11.90%	11.70%
Total net sales	$ 688.2	$ 688.6	$ 1,318.4	$ 1,306.7
Power
Segment Reporting Information [Line Items]
Operating Income	$ 78.9	$ 65.6	$ 131.2	$ 104.0
Operating Income as a % of Net Sales	15.50%	13.70%	13.60%	12.20%
Total net sales	$ 508.2	$ 478.1	$ 965.3	$ 851.2