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Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Future Amortization Expense      
2021 $ 58.3    
2022 52.8    
2023 52.6    
2024 52.6    
2025 52.6    
Thereafter 302.8    
Total, net, amortizable $ 571.7 $ 600.5 $ 661.7