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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Reconciliation of change in fair value of contingent consideration      
Beginning balance $ 6.8 $ 13.8 $ 14.5
Payment of contingent consideration (0.1) (3.9) 0.0
Change in fair value recognized in the statement of operations 3.5 (2.8) (1.1)
Translation adjustments recognized in other comprehensive income 0.7 (0.3) 0.4
Ending balance $ 10.9 $ 6.8 $ 13.8