3. FINANCING ACTIVITIES Long-term Debt Short-term Debt 4. RELATED PARTY TRANSACTIONS Payments on Behalf of Subsidiaries (a) Amounts reflect the impact of fair value hedge accounting. See “Accounting for Fair Value Hedging Strategies” section of Note 10 included in the 2020 Annual Report for additional information. Parent’s outstanding short-term debt was as follows: The following details long-term debt outstanding as of December 31, 2020 and 2019: (a) Certain Pollution Control Bonds are subject to redemption earlier than the maturity date. Long-term debt outstanding as of December 31, 2020 is payable as follows: Due to occasional time sensitivity and complexity of payments, Parent makes certain insurance, tax and benefit payments on behalf of subsidiary companies. Parent is then fully reimbursed by the subsidiary companies. Weighted-Average Interest Rate Ranges as of Outstanding as of Interest Rate as of December 31, December 31, Type of Debt Maturity December 31, 2020 2020 2019 2020 2019 (in millions) Senior Unsecured Notes 2020-2050 2.44% 0.70%-4.30% 2.15%-4.30% $ 4,123.6  $ 2,301.5  Pollution Control Bonds 2024-2029 (a) 2.26% 1.90%-2.60% 1.90%-2.60% 535.9  535.5  Junior Subordinate Notes 2022-2023 2.32% 1.30%-3.40% 3.40% 1,624.1  787.8  Total Long-term Debt Outstanding 6,283.6  3,624.8  Long-term Debt Due Within One Year 410.4  501.9  Long-term Debt $ 5,873.2  $ 3,122.9  2021 2022 2023 2024 2025 After 2025 Total (in millions) Principal Amount (a) $ 410.4  $ 1,115.7  $ 1,909.6  $ 306.5  $ 454.9  $ 2,148.6  $ 6,345.7  Unamortized Discount, Net and Debt Issuance Costs (62.1) Total Long-term Debt Outstanding $ 6,283.6  December 31, 2020 December 31, 2019 Type of Debt Outstanding Amount Weighted-Average Interest Rate Outstanding Amount Weighted-Average Interest Rate (in millions) (in millions) Commercial Paper $ 1,852.3  0.29 % $ 2,110.0  2.10 % Total Short-term Debt $ 1,852.3  $ 2,110.0  S-9