Industry Segments and Geographic Area Information - Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Sales:
Net sales	$ 5,372.9	$ 4,947.9	$ 4,194.1
Operating Income:
Operating Income	1,038.5	709.1	532.3
Long-lived Assets:
Long-Lived Assets	4,739.5	3,375.8	3,397.1
Assets held for sale - non-current	91.9	0.0
Electrical Solutions
Net Sales:
Net sales	2,111.2	2,076.8	1,859.7
Discontinued Operations, Disposed of by Sale | Commercial and Industrial Lighting Business
Long-lived Assets:
Total assets held for sale			356.6
Assets held for sale - non-current			177.1
United States
Net Sales:
Net sales	4,922.4	4,536.4	3,809.8
Operating Income:
Operating Income	937.0	598.5	439.6
Long-lived Assets:
Long-Lived Assets	4,250.7	2,983.5	3,038.1
United States | Electrical Solutions
Net Sales:
Net sales	1,831.7	1,820.6	1,604.9
International
Net Sales:
Net sales	450.5	411.5	384.3
Operating Income:
Operating Income	101.5	110.6	92.7
Long-lived Assets:
Long-Lived Assets	488.8	392.3	359.0
International | Electrical Solutions
Net Sales:
Net sales	$ 279.5	$ 256.2	$ 254.8