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Derivatives and Hedging Activities - Narrative (Details)
lb in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
lb
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
lb
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Fair value of derivatives          
Total asset derivatives $ 16,100,000   $ 16,100,000    
Total liability derivatives 21,700,000   21,700,000    
Cash collateral held by counterparties $ 0   0   $ 0
Net derivative gains included in AOCI expected to be reclassified into earnings     $ 4,200,000    
Cash flow hedges | Commodity contracts          
Fair value of derivatives          
Amounts of raw materials to be purchased from forward contracts (in pounds) | lb 16.0   16.0    
Fair value hedging | Interest Rate Swaps          
Fair value of derivatives          
Total notional amounts of interest rate contracts $ 150,000,000.0   $ 150,000,000.0   $ 150,000,000
Interest expense | Cash flow hedges | Interest Rate Swaps          
Fair value of derivatives          
Interest rate swaps net gains (losses) 100,000 $ 100,000 200,000 $ 200,000  
Interest expense | Fair value hedging | Interest Rate Swaps          
Fair value of derivatives          
Interest rate swaps net gains (losses) $ 100,000 $ (100,000) $ 100,000 $ (300,000)