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Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($)
Contract assets |
Beginning accounts receivable, net of allowances | $ 194.8
Change in accounts receivable | 29.7
Ending accounts receivable, net of allowances | 224.5
Beginning unbilled contract revenue | 54.5
Change in unbilled contract revenue | 27.1
Ending unbilled contract revenue | $ 81.6
Change in accounts receivable (as a percentage) | 15.20%
Change in unbilled contract revenue (as a percentage) | 49.70%
Contract liabilities |
Begining balance customer advances and billings in excess of contract revenue | $ 130.0
Change in customer advances and billings in excess of contract revenue | (9.5)
Ending balance customer advances and billings in excess of contract revenue | 120.5
Beginning long-term deferred revenue | 1.4
Change in long-term deferred revenue | (0.4)
Ending long-term deferred revenue | $ 1.0
Change in customer advances and billings in excess of contract revenue (as a percentage) | (7.30%)
Change in long-term deferred revenue (as a percentage) | (28.60%)

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