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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables present financial assets and liabilities measured and recorded at fair value on our Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of March 31, 2021 and December 31, 2020:
Recurring Fair Value Measurements March 31, 2021 (in millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance as of March 31, 2021
Assets |  |  |  |  |  |  |
Risk management assets | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Available-for-sale debt securities | — |  |  | 167.9 |  |  | — |  |  | 167.9 |
Total | $ | — |  |  | $ | 172.1 |  |  | $ | — |  |  | $ | 172.1 |
Liabilities |  |  |  |  |  |  |
Risk management liabilities | $ | — |  |  | $ | 101.0 |  |  | $ | — |  |  | $ | 101.0 |
Total | $ | — |  |  | $ | 101.0 |  |  | $ | — |  |  | $ | 101.0 |
Recurring Fair Value Measurements December 31, 2020 (in millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance as of December 31, 2020
Assets |  |  |  |  |  |  |
Risk management assets | $ | — |  |  | $ | 13.2 |  |  | $ | — |  |  | $ | 13.2 |
Available-for-sale debt securities | — |  |  | 170.9 |  |  | — |  |  | 170.9 |
Total | $ | — |  |  | $ | 184.1 |  |  | $ | — |  |  | $ | 184.1 |
Liabilities |  |  |  |  |  |  |
Risk management liabilities | $ | — |  |  | $ | 222.8 |  |  | $ | — |  |  | $ | 222.8 |
Total | $ | — |  |  | $ | 222.8 |  |  | $ | — |  |  | $ | 222.8 |
Schedule of Available-For-Sale Securities | The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at March 31, 2021 and December 31, 2020 were:
March 31, 2021 (in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses(1) |  | Allowance for Credit Losses |  | Fair Value
Available-for-sale debt securities |  |  |  |  |  |  |  |  |
U.S. Treasury debt securities | $ | 37.1 |  |  | $ | 0.2 |  |  | $ | (0.3) |  |  | $ | — |  |  | $ | 37.0 |
Corporate/Other debt securities | 126.7 |  |  | 5.3 |  |  | (0.8) |  |  | (0.3) |  |  | 130.9 |
Total | $ | 163.8 |  |  | $ | 5.5 |  |  | $ | (1.1) |  |  | $ | (0.3) |  |  | $ | 167.9 |
December 31, 2020 (in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses(2) |  | Allowance for Credit Losses |  | Fair Value
Available-for-sale debt securities |  |  |  |  |  |  |  |  |
U.S. Treasury debt securities | $ | 33.7 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 34.0 |
Corporate/Other debt securities | 130.2 |  |  | 7.7 |  |  | (0.5) |  |  | (0.5) |  |  | 136.9 |
Total | $ | 163.9 |  |  | $ | 8.0 |  |  | $ | (0.5) |  |  | $ | (0.5) |  |  | $ | 170.9 |
(1)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $22.1 and $25.7 million, respectively, at March 31, 2021. (2)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $0 million and $13.2 million, respectively, at December 31, 2020.
Carrying Amount And Estimated Fair Values Of Financial Instruments | The carrying amount and estimated fair values of these financial instruments were as follows:
(in millions) | Carrying Amount as of March 31, 2021 |  | Estimated Fair Value as of March 31, 2021 |  | Carrying Amount as of Dec. 31, 2020 |  | Estimated Fair Value as of Dec. 31, 2020
Long-term debt (including current portion) | $ | 9,246.7 |  |  | $ | 10,178.0 |  |  | $ | 9,243.1 |  |  | $ | 11,034.2 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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