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Debt - Revolving Credit Agreement (Details) - Revolving credit facility
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Jul. 20, 2021
Long-term debt    
Maximum borrowing capacity $ 300  
Letters of credit outstanding 0  
Amount borrowed 0  
Amount available for use $ 300  
Consolidated leverage ratio   3.75
LIBOR rate    
Long-term debt    
Contractual spread 1.50%