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Operations and Summary of Significant Accounting Policies - Interest Expense, Net Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Gain (Loss) on Extinguishment of Debt $ 0.0 $ 0.0 $ 24.5
Amortization of Deferred Hedge Gains     $ 4.7