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Derivatives and Hedging Activities - Narrative (Details)
lb in Millions
3 Months Ended
Sep. 30, 2020
USD ($)
lb
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Fair value of derivatives      
Total asset derivatives $ 12,300,000    
Total liability derivatives 13,300,000    
Cash collateral held by counterparties 0   $ 0
Net derivative gains included in AOCI expected to be reclassified into earnings $ 300,000    
Cash flow hedges | Commodity contracts      
Fair value of derivatives      
Amounts of raw materials to be purchased from forward contracts (in pounds) | lb 10.2    
Fair value hedging | Interest Rate Swaps      
Fair value of derivatives      
Total notional amounts of interest rate contracts $ 0.0   $ 150,000,000.0
Interest expense | Cash flow hedges | Interest Rate Swaps      
Fair value of derivatives      
Interest rate swaps net gains (losses) 100,000 $ 100,000  
Interest expense | Fair value hedging | Interest Rate Swaps      
Fair value of derivatives      
Interest rate swaps net gains (losses) $ 2,700,000 $ (0.0)