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Operations and Summary of Significant Accounting Policies (Summary of Interest Expense, Net) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Interest expense $ 25.4 $ 24.9 $ 28.8
Interest income (18.7) (9.9) (8.9)
Interest expense, net $ 6.7 $ 15.0 $ 19.9