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Pension Benefit Obligations - Level 3 (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Change in plan assets    
Fair value of plan assets at beginning of year $ 1,390.7  
Fair value of plan assets at end of year 784.9 $ 1,390.7
Fair Value, Inputs, Level 3 [Member]    
Change in plan assets    
Fair value of plan assets at beginning of year 4.0 3.4
Actual return on plan assets, relating to assets still held at reporting date   0.4
Actual return on plan assets, relating to assets sold during the period (0.2)  
Purchases, sales and settlements (3.5) 0.2
Change due to exchange rate changes $ (0.3)  
Fair value of plan assets at end of year   $ 4.0