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Debt (Schedule of Principal Repayments of Term Loan) (Details) - Credit Facility - Term Loan
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Debt Instrument [Line Items]  
2021 $ 15
2022 60
2023 100
2024 125
Due at the end of each calendar quarter starting December 31, 2021 until December 31, 2022  
Debt Instrument [Line Items]  
Quarterly installment payments 15
Due at the end of each calendar quarter until December 31, 2023, with the remaining balance due at maturity date on March 31, 2024  
Debt Instrument [Line Items]  
Quarterly installment payments $ 25