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Revenue (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Contract assets |  |  |
Beginning accounts receivable, net of allowances | $ 222.7 | $ 222.7 |
Change in accounts receivable | (20.6) | (18.3) | $ 5.8
Ending accounts receivable, net of allowances | 204.4 | 204.4 |
Beginning unbilled contract revenue | 37.0 | 43.5 |
Change in unbilled contract revenue | 0.0 | (2.3) | (6.2)
Ending unbilled contract revenue | 41.2 | $ 41.2 |
Change in accounts receivable (as a percentage) |  | 8.20% |
Change in unbilled contract revenue (as a percentage) |  | 5.30% |
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 | 8.8 | 8.6 | $ (3.4)
Ending customer advances and billings in excess of contract revenue | 108.9 | 108.9 |
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%) |
Change in customer advances and billings in excess of contract revenue (as a percentage) |  | (8.60%) |

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