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Summary of Significant Accounting Policies, Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss [Abstract] |  |  |
Unbilled contracts receivable | $ 593.8 | $ 593.1 |
Allowance For Doubtful Accounts, Current. [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance at beginning of the year | 66.7 | 67.6 | $ 66.5
Charged to income | 22.0 | 25.0 | 25.5
Write-off of uncollectible receivables | (15.8) | (23.2) | (22.1)
Impact of exchange rate movements and other | (2.2) | (2.7) | (2.3)
Allowance at end of the year | $ 70.7 | $ 66.7 | $ 67.6

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