Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 27, 2014	Jun. 28, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Dec. 28, 2013
Segment Reporting Information [Line Items]
External sales	$ 829.8		$ 768.2	$ 2,481.4	$ 2,368.4
Revenue from Related Parties	0		0	0	0
Total sales	829.8		768.2	2,481.4	2,368.4
Gross Profit	203.8		196.5	609.2	605.2
Operating Expenses	129.1		117.7	377.1	369.4
Other Cost and Expense, Operating	129.1		117.7	376.1	369.4
Asset Impairment Charges	0	1.0	0	1.0	0
Segment income from operations	74.7		78.8	232.1	235.8
Identifiable assets	3,671.4		3,709.3	3,671.4	3,709.3	3,643.5
Depreciation and amortization	35.6		31.7	103.6	95.1
Payments to Acquire Property, Plant, and Equipment	17.6		18.2	60.5	65.4
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	760.6		707.5	2,278.3	2,171.8
Revenue from Related Parties	0.8		1.2	2.5	3.2
Total sales	761.4		708.7	2,280.8	2,175.0
Gross Profit	185.5		180.1	557.1	552.9
Operating Expenses			109.0		341.8
Other Cost and Expense, Operating	119.5			347.8
Asset Impairment Charges				1.0
Segment income from operations	66.0		71.1	208.3	211.1
Identifiable assets	3,478.5		3,483.1	3,478.5	3,483.1
Depreciation and amortization	32.4		28.5	94.2	85.6
Payments to Acquire Property, Plant, and Equipment	16.1		15.3	54.9	58.4
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	69.2		60.7	203.1	196.6
Revenue from Related Parties	1.2		1.2	3.7	4.0
Total sales	70.4		61.9	206.8	200.6
Gross Profit	18.3		16.4	52.1	52.3
Operating Expenses			8.7		27.6
Other Cost and Expense, Operating	9.6			28.3
Asset Impairment Charges				0
Segment income from operations	8.7		7.7	23.8	24.7
Identifiable assets	192.9		226.2	192.9	226.2
Depreciation and amortization	3.2		3.2	9.4	9.5
Payments to Acquire Property, Plant, and Equipment	1.5		2.9	5.6	7.0
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0		0	0	0
Revenue from Related Parties	(2.0)		(2.4)	(6.2)	(7.2)
Total sales	(2.0)		(2.4)	(6.2)	(7.2)
Gross Profit	0		0	0	0
Operating Expenses			0		0
Other Cost and Expense, Operating	0			0
Asset Impairment Charges				0
Segment income from operations	0		0	0	0
Identifiable assets	0		0	0	0
Depreciation and amortization	0		0	0	0
Payments to Acquire Property, Plant, and Equipment	$ 0		$ 0	$ 0	$ 0

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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