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Pension Plans - Schedule of Net Benefit Costs (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 0.0 $ 0.0
Interest Cost 4.7 4.5
Expected return on plan assets (7.5) (8.6)
Amortization of unrecognized net losses 1.0 1.2
Settlement charge (0.1) 0.0
Net periodic benefit (credit)/cost (1.7) (2.9)
International    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 0.2 0.4
Interest Cost 1.1 0.9
Expected return on plan assets (1.6) (2.0)
Amortization of unrecognized net losses 0.5 0.9
Settlement charge 0.0 0.0
Net periodic benefit (credit)/cost $ 0.2 $ 0.2