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Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other comprehensive income, net of income taxes:        
Income tax on minimum pension liability adjustments $ (0.2) $ (0.3) $ (0.5) $ (0.6)