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Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($)
Contract assets |
Beginning accounts receivable, net of allowances | $ 194.8
Change in accounts receivable | 9.6
Ending accounts receivable, net of allowances | 204.4
Beginning unbilled contract revenue | 54.5
Change in unbilled contract revenue | 16.1
Ending unbilled contract revenue | $ 70.6
Change in accounts receivable (as a percentage) | 4.90%
Change in unbilled contract revenue (as a percentage) | 29.50%
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 | (1.7)
Ending balance customer advances and billings in excess of contract revenue | 128.3
Beginning long-term deferred revenue | 1.4
Change in long-term deferred revenue | (0.8)
Ending long-term deferred revenue | $ 0.6
Change in customer advances and billings in excess of contract revenue (as a percentage) | (1.30%)
Change in long-term deferred revenue (as a percentage) | (57.10%)

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