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Revenue (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Contract assets |  |  |
Beginning accounts receivable, net of allowances | $ 196.4 | $ 196.4 |
Change in accounts receivable | (19.1) | (23.5) | $ 5.6
Ending accounts receivable, net of allowances | 177.3 | 177.3 |
Beginning unbilled contract revenue | 43.0 | 36.5 |
Change in unbilled contract revenue | (8.8) | (10.2) | 18.5
Ending unbilled contract revenue | $ 34.2 | 34.2 |
Change in accounts receivable (as a percentage) | 9.70% |  |
Change in unbilled contract revenue (as a percentage) | 20.50% |  |
Contract liabilities |  |  |
Beginning customer advances and billings in excess of contract revenue | $ 99.7 | 109.6 |
Change in customer advances and billings in excess of contract revenue | (5.2) | (2.1) | $ 7.4
Ending customer advances and billings in excess of contract revenue | 94.5 | 94.5 |
Beginning long-term deferred revenue | 1.7 |  |
Change in long-term deferred revenue | (0.1) |  |
Ending long-term deferred revenue | $ 1.6 | $ 1.6 |
Change in customer advances and billings in excess of contract revenue (as a percentage) | 5.20% |  |
Change in long-term deferred revenue (as a percentage) | 5.90% |  |

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