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Deferred Revenue (Tables) | 12 Months Ended
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Dec. 31, 2017
Deferred Revenue. |
Schedule of deferred revenue | The amount of deferred revenue recognized related to separately priced extended product warranty contracts for the years ended December 31 follows:
(in millions) |  | 2017 |  | 2016 |  | 2015
Extended product warranty contracts amortization |  | $ | 20.4 |  |  | $ | 19.5 |  |  | $ | 18.5 |
The deferred revenue liability as of December 31 is summarized as follows:
(in millions) |  | 2017 |  | 2016
Extended product warranty contracts - current |  | $ | 19.8 |  |  | $ | 18.8 |
Customer prepayments - current |  | 8.0 |  |  | 4.4 |
Extended product warranty contracts - long-term |  | 188.0 |  |  | 172.0 |
Deferred revenue |  | $ | 215.8 |  |  | $ | 195.2 |

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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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