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Financial Instruments - Interest Rate Swaps (Details) - Interest Rate Swap - Cash Flow Hedging - Designated as Hedging Instrument
Jun. 30, 2021
USD ($)
Derivative [Line Items]  
Notional value $ 480,000,000
Minimum | London Interbank Offered Rate (LIBOR)  
Derivative [Line Items]  
Fixed interest rates 1.69%
Maximum | London Interbank Offered Rate (LIBOR)  
Derivative [Line Items]  
Fixed interest rates 2.37%