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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Contract assets |  |  |
Beginning accounts receivable, net of allowances | $ 222.7 | $ 222.7 |
Change in accounts receivable | 17.9 | (15.4) | $ 16.2
Ending accounts receivable, net of allowances | 207.3 | $ 207.3 |
Change in accounts receivable (as a percentage) |  | 6.90% |
Beginning unbilled contract revenue | 37.0 | $ 43.5 |
Change in unbilled contract revenue | 6.4 | (5.8) | (4.9)
Ending unbilled contract revenue | 37.7 | $ 37.7 |
Change in unbilled contract revenue (as a percentage) |  | 13.30% |
Contract liabilities |  |  |
Beginning customer advances and billings in excess of contract revenue | 110.2 | $ 100.3 |
Change in customer advances and billings in excess of contract revenue | 13.0 | 14.4 | $ 4.4
Ending customer advances and billings in excess of contract revenue | 114.7 | $ 114.7 |
Change in customer advances and billings in excess of contract revenue (as a percentage) |  | (14.40%) |
Beginning long-term deferred revenue |  | $ 2.6 |
Change in long-term deferred revenue |  | 0.1 |
Ending long-term deferred revenue | $ 2.7 | $ 2.7 |
Change in long-term deferred revenue (as a percentage) |  | (3.80%) |

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