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Operations and Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Trade Accounts Receivable |  |
Billed | $ 106.8 | $ 107.1
Unbilled | 23.8 | 29.2
Less: Allowance for Doubtful Accounts | 1.6 | 1.6
Total Trade Accounts Receivable | 129.0 | 134.7
Income Taxes Receivable | 8.2 | 3.2
Total Accounts Receivable | $ 137.2 | $ 137.9

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