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Fair Value of Financial Instruments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Estimated fair value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Senior Notes $ 1,778.4
Carrying value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Senior Notes $ 1,701.5