Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Segment Reporting Information [Line Items]
External sales	$ 850.4	$ 822.0	$ 1,651.6	$ 1,600.2
Revenue from Related Parties	0	0	0	0
Total sales	850.4	822.0	1,651.6	1,600.2
Gross Profit	211.0	209.2	405.4	408.7
Operating Expenses	123.3	128.1	248.0	251.7
Other Cost and Expense, Operating	122.3	128.1	247.0	251.7
Asset Impairment Charges	1.0	0	1.0	0
Segment income from operations	87.7	81.1	157.4	157.0
Identifiable assets	3,799.4	3,668.1	3,799.4	3,668.1	3,643.5
Depreciation and amortization	35.2	31.8	68.0	63.4
Payments to Acquire Property, Plant, and Equipment	20.6	26.6	42.9	47.2
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	780.9	753.3	1,517.7	1,464.3
Revenue from Related Parties	0.9	1.1	1.7	2.0
Total sales	781.8	754.4	1,519.4	1,466.3
Gross Profit	193.3	191.5	371.6	372.8
Operating Expenses		118.8		232.8
Other Cost and Expense, Operating	112.8		228.3
Asset Impairment Charges	1.0		1.0
Segment income from operations	79.5	72.7	142.3	140.0
Identifiable assets	3,596.4	3,441.3	3,596.4	3,441.3
Depreciation and amortization	32.0	28.7	61.8	57.1
Payments to Acquire Property, Plant, and Equipment	19.3	24.4	(38.8)	(43.1)
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	69.5	68.7	133.9	135.9
Revenue from Related Parties	1.4	1.7	2.5	2.8
Total sales	70.9	70.4	136.4	138.7
Gross Profit	17.7	17.7	33.8	35.9
Operating Expenses		9.3		18.9
Other Cost and Expense, Operating	9.5		18.7
Asset Impairment Charges	0		0
Segment income from operations	8.2	8.4	15.1	17.0
Identifiable assets	203.0	226.8	203.0	226.8
Depreciation and amortization	3.2	3.1	6.2	6.3
Payments to Acquire Property, Plant, and Equipment	1.3	2.2	(4.1)	(4.1)
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0	0	0	0
Revenue from Related Parties	(2.3)	(2.8)	(4.2)	(4.8)
Total sales	(2.3)	(2.8)	(4.2)	(4.8)
Gross Profit	0	0	0	0
Operating Expenses		0		0
Other Cost and Expense, Operating	0		0
Asset Impairment Charges	0		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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