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Operations and Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Trade Accounts Receivable |  |
Billed | $ 115.9 | $ 106.8
Unbilled | 27.2 | 23.8
Less: Allowance for Doubtful Accounts | 1.7 | 1.6
Total Trade Accounts Receivable | 141.4 | 129.0
Income Taxes Receivable | 6.7 | 8.2
Total Accounts Receivable | $ 148.1 | $ 137.2

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