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Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Contract assets |
Beginning accounts receivable, net of allowances | $ 200.8
Change in accounts receivable | 36.3
Ending accounts receivable, net of allowances | 237.1
Beginning unbilled contract revenue | 79.4
Change in unbilled contract revenue | 15.0
Ending unbilled contract revenue | $ 94.4
Change in accounts receivable (as a percentage) | 18.10%
Change in unbilled contract revenue (as a percentage) | 18.90%
Contract liabilities |
Beginning balance customer advances and billings in excess of contract revenue | $ 118.9
Change in customer advances and billings in excess of contract revenue | 44.7
Ending balance customer advances and billings in excess of contract revenue | 163.6
Beginning long-term deferred revenue | 1.9
Change in long-term deferred revenue | (1.8)
Ending long-term deferred revenue | $ 0.1
Change in customer advances and billings in excess of contract revenue (as a percentage) | 37.60%
Change in long-term deferred revenue (as a percentage) | (94.70%)

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