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Long-Term Debt (Narrative 2019 and 2021 Senior Notes) (Details) - USD ($)
Mar. 01, 2021
Dec. 02, 2019
Mar. 31, 2021
2019 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount   $ 400,000,000.0  
Debt instrument, stated interest rate (as percent)   5.125%  
2019 Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Early repayment of senior debt   $ 400,000,000.0  
2021 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 600,000,000.0    
Debt instrument, stated interest rate (as percent) 3.75%    
2021 Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate (as percent)     3.75%
Early repayment of senior debt $ 600,000,000.0