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Summary of Significant Accounting Policies Capitalized Software (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]      
Capitalized software less accumulated amortization $ 836,000,000.0 $ 864,300,000 $ 795,000,000.0
Write-offs of impaired software $ 71,700,000