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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | The following table summarizes our contract assets and contract liabilities (in millions):
| June 30, 2019 |  | December 31, 2018
Current contract assets | $ | 12.8 |  |  | $ | 4.0 |
Current contract liabilities (deferred revenue) | $ | 46.2 |  |  | $ | 56.9 |
Noncurrent contract liabilities (deferred revenue) | $ | 14.8 |  |  | $ | 20.5 |
Significant changes in contract assets and liabilities during the period are as follows (in millions):
| Contract Assets |  | Contract Liabilities
Balance as of December 31, 2018 | $ | 4.0 |  |  | $ | 77.4 |
Contract assets acquired and liabilities assumed in the Rowan Transaction | 8.4 |  |  | 5.3 |
Revenue recognized in advance of right to bill customer | 2.3 |  |  | — |
Increase due to cash received | — |  |  | 34.3 |
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance | — |  |  | (40.2 | )
Decrease due to amortization of deferred revenue that was added during the period | — |  |  | (15.8 | )
Decrease due to transfer to receivables during the period | (1.9 | ) |  | — |
Balance as of June 30, 2019 | $ | 12.8 |  |  | $ | 61.0 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | Expected future amortization of our contract liabilities and deferred costs recorded as of June 30, 2019 is set forth in the table below (in millions):
| Remaining 2019 |  | 2020 |  | 2021 |  | 2022 and Thereafter |  | Total
Amortization of contract liabilities | $ | 39.0 |  |  | $ | 11.7 |  |  | $ | 7.6 |  |  | $ | 2.7 |  |  | $ | 61.0 |
Amortization of deferred costs | $ | 39.7 |  |  | $ | 13.3 |  |  | $ | 2.8 |  |  | $ | 1.4 |  |  | $ | 57.2 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&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=109196051&loc=SL49130556-203045 + Details
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