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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 111.0 $ 101.5 $ 101.1
Additions for tax positions of current year 1.2 7.1 0.0
Additions for tax positions of prior years 2.6 2.4 0.5
Reductions for tax positions of prior years (7.5) 0.0 (0.1)
Reductions for tax positions resulting from lapse of statute of limitations (0.1) 0.0 0.0
Settlements (65.7) 0.0 0.0
Balance at end of year $ 41.5 $ 111.0 $ 101.5