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Revenue - Change in Contract Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Contract assets |  |
Accounts receivable, net of allowances | $ 799.6 | $ 758.9
Unbilled contract revenue | 553.6 | 481.7
Contract liabilities |  |
Customer advances and billings in excess of contract revenue | $ 389.8 | $ 376.6

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