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Investments - Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 30, 2018
Dec. 31, 2019
Jun. 30, 2019
Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     40.00%
Madison Paper Industries Owned Consolidated Subsidiary      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     80.00%
Ownership of Madison Paper Industries by Consolidated Subsidiary      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     50.00%
UPM-Kymmene | Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     60.00%
Madison Paper Industries | Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Noncontrolling interest, ownership percentage by parent     10.00%
Madison Paper Industries | Madison Paper Industries Owned Consolidated Subsidiary      
Schedule of Equity Method Investments [Line Items]      
Noncontrolling interest, ownership percentage by parent     20.00%
Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Gain on sale of non-hydro power assets $ 12.5    
Forecast | Madison Paper Industries | Minimum      
Schedule of Equity Method Investments [Line Items]      
Gain on sale of non-hydro power assets   $ 5.0  
Forecast | Madison Paper Industries | Maximum      
Schedule of Equity Method Investments [Line Items]      
Gain on sale of non-hydro power assets   $ 8.0