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Deferred Revenue and Extended Product Warranty | 6 Months Ended
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Jun. 30, 2017
Deferred Revenue Disclosure [Abstract] |
Deferred Revenue and Extended Product Warranty | Deferred Revenue and Extended Product Warranty Deferred revenue consists primarily of unearned revenue related to separately priced extended product warranty contracts on sales of certain products, the most significant being those offered on the installed roofing systems within the Construction Materials segment. Other deferred revenue relates to customer prepayments on sales within the Fluid Technologies segment. Deferred revenue related to our separately priced extended warranty contracts recognized in the Condensed Consolidated Statements of Earnings were as follows:
(in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Extended product warranty contracts amortization |  | $ | 5.1 |  |  | $ | 4.9 |  |  | $ | 10.0 |  |  | $ | 9.6 |
Deferred revenue included in the Condensed Consolidated Balance Sheets were as follows:
(in millions) |  | June 30, 2017 |  | December 31, 2016
Extended product warranty contracts - current |  | $ | 19.0 |  |  | $ | 18.8 |
Customer prepayments - current |  | 12.2 |  |  | 4.4 |
Extended product warranty contracts - long-term |  | 177.3 |  |  | 172.0 |
Deferred revenue |  | $ | 208.5 |  |  | $ | 195.2 |
Expected costs of services to be performed under our roofing systems extended product warranty contracts are actuarially determined. Any expected costs in excess of deferred revenue are recognized within accrued expenses.

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