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Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Contract assets |
Beginning accounts receivable, net of allowances | $ 191.6
Change in accounts receivable | (28.0)
Ending accounts receivable, net of allowances | 163.6
Beginning unbilled contract revenue | 86.1
Change in unbilled contract revenue | 11.0
Ending unbilled contract revenue | $ 97.1
Change in accounts receivable (as a percentage) | (14.60%)
Change in unbilled contract revenue (as a percentage) | 12.80%
Contract liabilities |
Beginning balance customer advances and billings in excess of contract revenue | $ 127.7
Change in customer advances and billings in excess of contract revenue | (3.0)
Ending balance customer advances and billings in excess of contract revenue | $ 124.7
Change in customer advances and billings in excess of contract revenue (as a percentage) | (2.30%)

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