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Employee Benefit Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension benefit    
Components of net periodic benefit cost    
Service cost $ 2.9 $ 2.5
Interest cost 4.1 4.3
Expected return on plan assets (4.9) (5.1)
Amortization of prior service cost (benefit) 0.6 0.4
Amortization of net actuarial loss (gain) 1.2 0.8
Expenses paid 0.7 1.0
Net periodic benefit cost 4.6 3.9
Other post-employment benefit    
Components of net periodic benefit cost    
Service cost 0.6 0.9
Interest cost 0.3 0.4
Amortization of prior service cost (benefit) (0.4) (0.2)
Amortization of net actuarial loss (gain) 0.1 (0.1)
Net periodic benefit cost $ 0.6 $ 1.0