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Employee Benefit Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension benefit        
Components of net periodic benefit cost        
Service cost $ 2.5 $ 2.4 $ 7.6 $ 7.2
Interest cost 4.2 4.6 12.8 14.0
Expected return on plan assets (5.1) (4.9) (15.4) (14.9)
Amortization of prior service cost (benefit) 0.4 0.4 1.2 1.3
Curtailment       1.2
Amortization of net actuarial loss (gain) 0.9   2.5 0.1
Expenses paid 1.0 0.6 3.0 1.8
Net periodic benefit cost 3.9 3.1 11.7 10.7
Other post-employment benefit        
Components of net periodic benefit cost        
Service cost 0.9 0.8 2.6 2.3
Interest cost 0.4 0.5 1.2 1.5
Amortization of prior service cost (benefit) (0.2) (0.4) (0.7) (1.1)
Amortization of net actuarial loss (gain)   (0.1) (0.1) (0.2)
Net periodic benefit cost $ 1.1 $ 0.8 $ 3.0 $ 2.5