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Summary of Significant Accounting Policies Capitalized Software (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]      
Capitalized software less accumulated amortization $ 691.2 $ 864.3 $ 795.0
Write-offs of impaired software $ 26.3