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Pay vs Performance Disclosure - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Pay vs Performance Disclosure              
Net earnings (loss) $ (56.0) $ 57.1 $ (214.4) $ (213.3) $ 15.5 $ (25.1) $ (185.2)