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Debt (Details) - Senior Notes
£ in Millions, $ in Millions
3 Months Ended
Sep. 30, 2020
GBP (£)
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]    
Extinguishment of debt, amount £ 80 $ 102.9
Debt instrument, interest rate, stated percentage 4.68% 4.68%