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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Abstract] |  |  |  |
Contract liability | $ 138.5 | $ 138.5 |  | $ 126.1
Contract liability, revenue recognized | 6.0 | 11.7 |  |
Contract asset | $ 9.2 | $ 9.2 | $ 9.2 |

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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