Industry Segments and Geographic Area Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Summary of Industry Segment Data

INDUSTRY SEGMENT DATA

	2017			2016			2015
Net Sales:
Electrical	$	2,532.8		$	2,460.2		$	2,388.3
Power	1,136.0			1,045.0			1,002.1
TOTAL NET SALES	$	3,668.8		$	3,505.2		$	3,390.4
Operating Income:
Electrical	$	282.5		$	267.4		$	279.0
Power	221.2			210.4			195.6
Operating Income	$	503.7		$	477.8		$	474.6
Interest expense	(44.9		)	(43.4		)	(31.0		)
Loss on extinguishment of debt	(10.1		)	—			—
Investment income and other expense, net	(5.6		)	(4.0		)	(25.0		)
INCOME BEFORE INCOME TAXES	$	443.1		$	430.4		$	418.6
Assets:
Electrical	$	2,344.7		$	2,246.0		$	2,120.9
Power	1,102.2			911.5			839.7
General Corporate	273.7			367.5			248.1
TOTAL ASSETS	$	3,720.6		$	3,525.0		$	3,208.7
Capital Expenditures:
Electrical	$	48.0		$	43.4		$	47.9
Power	29.0			22.7			28.4
General Corporate	2.7			1.1			0.8
TOTAL CAPITAL EXPENDITURES	$	79.7		$	67.2		$	77.1
Depreciation and Amortization:
Electrical	$	65.7		$	61.2		$	56.2
Power	34.1			31.1			29.0
TOTAL DEPRECIATION AND AMORTIZATION	$	99.8		$	92.3		$	85.2

Summary of Product Class Data

PRODUCT CLASS DATA

	2017		2016		2015
Net Sales:
Electrical Systems	$	1,597.1	$	1,514.4	$	1,476.7
Lighting	935.7		945.8		911.6
Power	1,136.0		1,045.0		1,002.1
TOTAL NET SALES	$	3,668.8	$	3,505.2	$	3,390.4

Summary of Geographic Area Data

GEOGRAPHIC AREA DATA

	2017		2016		2015
Net Sales:
United States	$	3,280.9	$	3,147.4	$	3,008.4
International	387.9		357.8		382.0
TOTAL NET SALES	$	3,668.8	$	3,505.2	$	3,390.4
Operating Income:
United States	$	422.1	$	419.1	$	426.1
International	81.6		58.7		48.5
TOTAL OPERATING INCOME	$	503.7	$	477.8	$	474.6
Long-lived Assets:
United States	$	1,877.4	$	1,762.9	$	1,627.7
International	232.8		200.1		187.1
TOTAL LONG-LIVED ASSETS	$	2,110.2	$	1,963.0	$	1,814.8