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Long-Term Debt, Revolving Credit Facility (Details) - The "Revolving Credit Facility" - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 15, 2019
Jan. 14, 2019
Dec. 31, 2018
Debt        
Maximum borrowing capacity   $ 2,500.0 $ 2,000.0  
Borrowings under the Revolving Credit Facility $ 0.0     $ 0.0