Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) group	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Net sales	$ 907.4	$ 877.0	$ 2,651.0	$ 2,560.7
Operating Income	$ 136.0	$ 131.0	$ 370.0	$ 362.7
Operating Income as a % of Net Sales	15.00%	14.90%	14.00%	14.20%
Electrical
Segment Reporting Information [Line Items]
Number of business groups (in groups) | group			3
Net sales	$ 634.6	$ 617.5	$ 1,858.7	$ 1,802.3
Operating Income	$ 80.9	$ 78.8	$ 213.5	$ 216.6
Operating Income as a % of Net Sales	12.70%	12.80%	11.50%	12.00%
Power
Segment Reporting Information [Line Items]
Net sales	$ 272.8	$ 259.5	$ 792.3	$ 758.4
Operating Income	$ 55.1	$ 52.2	$ 156.5	$ 146.1
Operating Income as a % of Net Sales	20.20%	20.10%	19.80%	19.30%