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Pension Plans - Schedule of Net Benefit Costs (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost 5.1 4.7 15.3 14.1
Expected return on plan assets (6.6) (7.5) (19.6) (22.6)
Amortization of unrecognized net losses 1.1 1.1 3.1 3.3
Settlement charge     0.0 0.1
Net periodic (benefit)/cost (0.4) (1.7) (1.2) (5.1)
International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 0.1 0.4 0.4
Interest cost 0.8 1.1 2.3 3.2
Expected return on plan assets (1.3) (1.6) (3.8) (4.8)
Amortization of unrecognized net losses 0.2 0.5 0.7 1.6
Settlement charge     0.0 0.0
Net periodic (benefit)/cost $ (0.2) $ 0.1 $ (0.4) $ 0.4