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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | The following table summarizes our trade receivables, contract assets and contract liabilities (in millions):
| June 30, 2018 |  | December 31, 2017
Current contract assets | $ | 4.1 |  |  | $ | 3.0 |
Noncurrent contract assets | $ | — |  |  | $ | 2.8 |
Current contract liabilities (deferred revenue) | $ | 76.6 |  |  | $ | 71.9 |
Noncurrent contract liabilities (deferred revenue) | $ | 23.2 |  |  | $ | 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 | — |  |  | 27.6 |
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance | — |  |  | (43.0 | )
Decrease due to amortization of deferred revenue that was added during the period | — |  |  | (7.9 | )
Decrease due to transfer to receivables during the period | (1.7 | ) |  | — |
Balance as of June 30, 2018 | $ | 4.1 |  |  | $ | 99.8 |
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, 2018 is set forth in the table below (in millions):
| Remaining 2018 |  | 2019 |  | 2020 |  | 2021 and Thereafter |  | Total
Amortization of contract liabilities | $ | 38.9 |  |  | $ | 51.0 |  |  | $ | 6.4 |  |  | $ | 3.5 |  |  | $ | 99.8 |
Amortization of deferred costs | $ | 23.4 |  |  | $ | 21.6 |  |  | $ | 6.0 |  |  | $ | 2.4 |  |  | $ | 53.4 |

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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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