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Other Long-Term Liabilities - Summary (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Other Liabilities Disclosure [Abstract]      
Pension obligation $ 0.0 $ 0.0 $ 6.8
Contingent consideration 7.4 3.7 10.4
Other 7.3 4.3 1.0
Total other long-term liabilities $ 14.7 $ 8.0 $ 18.2