XML 61 R38.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Short-Term and Long-Term Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Debt Disclosure [Abstract] |
Long-term Debt [Table Text Block] |
Long-Term Debt |  |
As of December 31 | 2018 |  | 2017 |
Millions |  |
First Mortgage Bonds |  |
1.83% Series Due 2018 | — |  |  | $50.0 |
8.17% Series Due 2019 |  | $42.0 |  | 42.0 |
5.28% Series Due 2020 | 35.0 |  | 35.0 |
2.80% Series Due 2020 | 40.0 |  | 40.0 |
4.85% Series Due 2021 | 15.0 |  | 15.0 |
3.02% Series Due 2021 | 60.0 |  | 60.0 |
3.40% Series Due 2022 | 75.0 |  | 75.0 |
6.02% Series Due 2023 | 75.0 |  | 75.0 |
3.69% Series Due 2024 | 60.0 |  | 60.0 |
4.90% Series Due 2025 | 30.0 |  | 30.0 |
5.10% Series Due 2025 | 30.0 |  | 30.0 |
3.20% Series Due 2026 | 75.0 |  | 75.0 |
5.99% Series Due 2027 | 60.0 |  | 60.0 |
3.30% Series Due 2028 | 40.0 |  | 40.0 |
3.74% Series Due 2029 | 50.0 |  | 50.0 |
3.86% Series Due 2030 | 60.0 |  | 60.0 |
5.69% Series Due 2036 | 50.0 |  | 50.0 |
6.00% Series Due 2040 | 35.0 |  | 35.0 |
5.82% Series Due 2040 | 45.0 |  | 45.0 |
4.08% Series Due 2042 | 85.0 |  | 85.0 |
4.21% Series Due 2043 | 60.0 |  | 60.0 |
4.95% Series Due 2044 | 40.0 |  | 40.0 |
5.05% Series Due 2044 | 40.0 |  | 40.0 |
4.39% Series Due 2044 | 50.0 |  | 50.0 |
4.07% Series Due 2048 | 60.0 |  | — |
Variable Demand Revenue Refunding Bonds Series 1997 A Due 2020 | 13.5 |  | 13.5 |
Unsecured Term Loan Variable Rate Due 2020 | 10.0 |  | 40.0 |
Armenia Mountain Senior Secured Notes 3.26% Due 2024 | 57.2 |  | 65.9 |
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025 | 27.8 |  | 27.8 |
Senior Unsecured Notes 3.11% Due 2027 | 80.0 |  | 80.0 |
SWL&P First Mortgage Bonds 4.15% Series Due 2028 | 15.0 |  | 15.0 |
SWL&P First Mortgage Bonds 4.14% Series Due 2048 | 12.0 |  | — |
Other Long-Term Debt, 3.11% – 5.75% Due 2019 – 2037 | 67.7 |  | 69.1 |
Unamortized Debt Issuance Costs | (9.2 | ) | (10.0 | )
Total Long-Term Debt | 1,486.0 |  | 1,503.3 |
Less: Due Within One Year | 57.5 |  | 64.1 |
Net Long-Term Debt |  | $1,428.5 |  |  | $1,439.2 |

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
Name: | us-gaap_ScheduleOfDebtInstrumentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration