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Income Taxes (Accounting for Uncertainty in Tax Positions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Gross unrecognized tax benefits - beginning of the year $ 26.5 $ 11.4
Increases as a resulting of tax positions taken during a prior-year period 0.6 11.3
Decreases as a result of tax positions taken during a prior-year period (14.3) 0.0
Increases as a result of tax positions taken during the current period 1.9 7.7
Decreases relating to settlements with tax authorities (0.4) (3.1)
Decreases as a result of lapse of the applicable statute of limitations (1.3) (0.8)
Gross unrecognized tax benefits - end of the year $ 13.0 $ 26.5