SEGMENTS INFORMATION

12 Months Ended

Dec. 31, 2019

We use operating income to measure segment profitability and to allocate resources to our businesses. At December 31, 2019, we reported two segments, which are described below.

Our utility segment includes our electric and natural gas utility operations, which serve customers in northeastern and central Wisconsin. Our electric utility operations are engaged in the generation, distribution, and sale of electricity. Our natural gas utility operations are engaged in the purchase, distribution, and sale of natural gas to retail customers as well as the transportation of customer-owned natural gas.

Our other segment primarily consists of equity earnings from our investment in WRPC.

All of our operations and assets are located within the United States. The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2019, 2018, and 2017.



2019 (in millions)	Utility		Other		Wisconsin Public Service Corporation
External revenues	$	1,411.9	$	—	$	1,411.9
Other operation and maintenance	396.2		—		396.2
Depreciation and amortization	166.2		—		166.2
Operating income	267.6		—		267.6
Other income, net	38.2		1.4		39.6
Interest expense	63.4		—		63.4
Capital expenditures	517.8		—		517.8
Total assets	5,595.7		45.9		5,641.6



2018 (in millions)	Utility		Other			Wisconsin Public Service Corporation
External revenues	$	1,498.5	$	—		$	1,498.5
Other operation and maintenance	447.5		0.5			448.0
Depreciation and amortization	141.9		—			141.9
Operating income (loss)	267.1		(0.7		)	266.4
Other income, net	35.2		2.4			37.6
Interest expense	53.9		—			53.9
Capital expenditures and asset acquisitions	521.4		—			521.4
Total assets	5,151.5		66.2			5,217.7



2017 (in millions)	Utility		Other			Wisconsin Public Service Corporation
External revenues	$	1,485.4	$	—		$	1,485.4
Other operation and maintenance	446.1		1.5			447.6
Depreciation and amortization	139.3		—			139.3
Operating income (loss)	286.7		(1.6		)	285.1
Other income, net	21.0		2.7			23.7
Interest expense	54.2		—			54.2
Capital expenditures	335.8		—			335.8
Total assets	4,678.1		70.6			4,748.7