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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability | The following table summarizes our trade receivables, contract assets and contract liabilities (in millions):
| March 31, 2018 |  | December 31, 2017
Current contract assets | $ | 3.7 |  |  | $ | 3.0 |
Noncurrent contract assets | $ | 1.5 |  |  | $ | 2.8 |
Current contract liabilities (deferred revenue) | $ | 78.0 |  |  | $ | 71.9 |
Noncurrent contract liabilities (deferred revenue) | $ | 42.1 |  |  | $ | 51.2 |
Significant changes in contract assets and liabilities during the period are as follows (in millions):
| Contract Assets |  | Contract Liabilities
Balance as of December 31, 2017 | $ | 5.8 |  |  | $ | 123.1 |
Increase due to cash received | — |  |  | 24.6 |
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance | — |  |  | (24.8 | )
Decrease due to amortization of deferred revenue that was added during the period | — |  |  | (2.8 | )
Decrease due to transfer to receivables during the period | (0.6 | ) |  |
Balance as of March 31, 2018 | $ | 5.2 |  |  | $ | 120.1 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | Expected future amortization of our contract liabilities and deferred costs recorded as of March 31, 2018 is set forth in the table below (in millions):
| Remaining 2018 |  | 2019 |  | 2020 |  | 2021 and Thereafter |  | Total
Amortization of contract liabilities | $ | 59.9 |  |  | $ | 50.7 |  |  | $ | 6.2 |  |  | $ | 3.3 |  |  | $ | 120.1 |
Amortization of deferred costs | $ | 32.2 |  |  | $ | 19.7 |  |  | $ | 5.2 |  |  | $ | 2.0 |  |  | $ | 59.1 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 + Details
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