Segment Information The Company's reporting segments consist of the Electrical segment and the Power segment. The Electrical segment comprises businesses that sell stock and custom products including standard and special application wiring device products, rough-in electrical products, connector and grounding products, lighting fixtures and controls, components and assemblies for the natural gas distribution market and other electrical equipment. The products are typically used in and around industrial, commercial and institutional facilities by electrical contractors, maintenance personnel, electricians, utilities, and telecommunications companies. In addition, certain businesses design and manufacture a variety of high voltage test and measurement equipment, industrial controls and communication systems used in the non-residential and industrial markets. Many of these products are designed such that they can also be used in harsh and hazardous locations where a potential for fire and explosion exists due to the presence of flammable gasses and vapors. Harsh and hazardous products are primarily used in the oil and gas (onshore and offshore) and mining industries. There are also a variety of lighting fixtures, wiring devices and electrical products that have residential and utility applications, including residential products with Internet-of-Things ("IoT") enabled technologies. These products are primarily sold through electrical and industrial distributors, home centers, retail and hardware outlets, lighting showrooms and residential product oriented internet sites. Special application products are primarily sold through wholesale distributors to contractors, industrial customers and OEMs. High voltage products are also sold direct to customers through our sales engineers. The Electrical segment comprises three business groups, which have been aggregated as they have similar long-term economic characteristics, customers and distribution channels, among other factors. The Power segment consists of operations that design and manufacture various distribution, transmission, substation and telecommunications products primarily used by the electrical utility industry. In addition, certain of these products are used in the civil construction, water utility, and transportation industries. Products are sold to distributors and directly to users such as utilities, telecommunication companies, pipeline and mining operations, industrial firms, and construction and engineering firms. The 2018 acquisition of Aclara expanded offerings to include advanced metering infrastructure, meter and edge devices, and software and infrastructure services, which are primarily sold to the electrical, water, and gas utility industries. The following table sets forth financial information by business segment (in millions): Net Sales Operating Income Operating Income as a % of Net Sales 2019 2018 2019 2018 2019 2018 Three Months Ended September 30, Electrical $ 689.3 $ 687.4 $ 90.2 $ 94.0 13.1 % 13.7 % Power 514.7 492.3 82.7 69.8 16.1 % 14.2 % TOTAL $ 1,204.0 $ 1,179.7 $ 172.9 $ 163.8 14.4 % 13.9 % Nine Months Ended September 30, Electrical $ 2,007.7 $ 1,994.1 $ 246.8 $ 246.5 12.3 % 12.4 % Power 1,480.0 1,343.5 213.9 173.8 14.5 % 12.9 % TOTAL $ 3,487.7 $ 3,337.6 $ 460.7 $ 420.3 13.2 % 12.6 %