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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2023
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] | The following table summarizes our contract assets and contract liabilities (in millions):
| September 30, 2023 |  |  | December 31, 2022
Current contract assets | $ | 0.5 |  |  |  | $ | 4.6 |
Noncurrent contract assets | $ | 3.0 |  |  |  | $ | 0.7 |
Current contract liabilities (deferred revenue) | $ | 103.4 |  |  |  | $ | 78.0 |
Noncurrent contract liabilities (deferred revenue) | $ | 43.3 |  |  |  | $ | 41.0 |
Changes in contract assets and liabilities during the period are as follows (in millions):
| Contract Assets |  | Contract Liabilities
Balance as of December 31, 2022 | $ | 5.3 |  |  | $ | 119.0 |
Revenue recognized in advance of right to bill customer | 5.3 |  |  | — |
Increase due to revenue deferred during the period | — |  |  | 119.4 |
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance | — |  |  | (53.3) |
Decrease due to amortization of deferred revenue added during the period | — |  |  | (29.9) |
Decrease due to transfer to receivables and payables during the period | (7.1) |  |  | (8.5) |
Balance as of September 30, 2023 | $ | 3.5 |  |  | $ | 146.7 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | The table below reflects the expected future amortization of our contract liabilities and deferred costs recorded as of September 30, 2023. In the case of our contract liabilities related to our bareboat charter arrangements with ARO, the contract liability is not amortized and as such, the amount is reflected in the table below at the end of the current lease term. See "Note 3 - Equity Method Investment in ARO" for additional information on ARO and related arrangements.
| (In millions)
| Remaining 2023 |  | 2024 |  | 2025 |  | 2026 and Thereafter |  |  | Total
Amortization of contract liabilities | $ | 34.8 |  |  | $ | 95.3 |  |  | $ | 13.4 |  |  | $ | 3.2 |  |  |  | $ | 146.7 |
Amortization of deferred costs | $ | 32.9 |  |  | $ | 54.8 |  |  | $ | 10.8 |  |  | $ | 4.3 |  |  |  | $ | 102.8 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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