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Long-term debt - Borrowings redemption prices (Details)
Dec. 23, 2020
Jun. 24, 2020
Senior unsecured notes - due July 15, 2027    
Long Term Debt    
Borrowings redemption price percentage   100.00%
2020 | Senior unsecured notes - due May 15, 2025    
Long Term Debt    
Borrowings redemption price percentage 104.78%  
2021 | Senior unsecured notes - due May 15, 2025    
Long Term Debt    
Borrowings redemption price percentage 103.19%  
Year 3 | Senior unsecured notes - due May 15, 2025    
Long Term Debt    
Borrowings redemption price percentage 101.59%  
Year 3 | Senior unsecured notes - due July 15, 2027    
Long Term Debt    
Borrowings redemption price percentage   103.75%
Year 4 | Senior unsecured notes - due May 15, 2025    
Long Term Debt    
Borrowings redemption price percentage 100.00%  
Year 4 | Senior unsecured notes - due July 15, 2027    
Long Term Debt    
Borrowings redemption price percentage   101.88%
2025 and thereafter | Senior unsecured notes - due July 15, 2027    
Long Term Debt    
Borrowings redemption price percentage   100.00%