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Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Contract assets |
Beginning accounts receivable, net of allowances | $ 200.8
Change in accounts receivable | 19.2
Ending accounts receivable, net of allowances | 220.0
Beginning unbilled contract revenue | 79.4
Change in unbilled contract revenue | (11.2)
Ending unbilled contract revenue | $ 68.2
Change in accounts receivable (as a percentage) | 9.60%
Change in unbilled contract revenue (as a percentage) | (14.10%)
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 | 7.2
Ending balance customer advances and billings in excess of contract revenue | 126.1
Beginning long-term deferred revenue | 1.9
Change in long-term deferred revenue | (0.9)
Ending long-term deferred revenue | $ 1.0
Change in customer advances and billings in excess of contract revenue (as a percentage) | 6.10%
Change in long-term deferred revenue (as a percentage) | (47.40%)

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