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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 |  | December 31, 2019
Current contract assets | $ | 7.0 |  |  | $ | 3.5 |
Noncurrent contract assets | $ | .1 |  |  | $ | — |
Current contract liabilities (deferred revenue) | $ | 38.9 |  |  | $ | 30.0 |
Noncurrent contract liabilities (deferred revenue) | $ | 7.1 |  |  | $ | 9.7 |
Changes in contract assets and liabilities during the period are as follows (in millions):
| Contract Assets |  | Contract Liabilities
Balance as of December 31, 2019 | $ | 3.5 |  |  | $ | 39.7 |
Revenue recognized in advance of right to bill customer | 8.3 |  |  | — |
Increase due to cash received | — |  |  | 40.0 |
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance | — |  |  | (21.6) |
Decrease due to amortization of deferred revenue that was added during the period | — |  |  | (12.1) |
Decrease due to transfer to receivables during the period | (4.7) |  |  | — |
Balance as of September 30, 2020 | $ | 7.1 |  |  | $ | 46.0 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | Expected future amortization of our contract liabilities and deferred costs recorded as of September 30, 2020 is set forth in the table below (in millions):
| Remaining 2020 |  | 2021 |  | 2022 |  | 2023 and Thereafter |  | Total
Amortization of contract liabilities | $ | 15.1 |  |  | $ | 26.8 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | 46.0 |
Amortization of deferred costs | $ | 7.8 |  |  | $ | 15.2 |  |  | $ | 3.3 |  |  | $ | .5 |  |  | $ | 26.8 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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